PL ommunications hapter In This hapter... Introduction... PL ommunication Ports Specifications... LE Status Indicators... Steps to Using the LIK PL ommunications... Typical ommunications pplications... W-: om Port & (RS-) Wiring... W-: om Port Wiring... W-: om Port Wiring... 0 -: om Port (RS-) Setup... -: om Port (Ethernet) Setup... -: om Port Setup (Modbus RTU)... -: om Port Setup (SII)... -: om Port Setup (Modbus RTU)... -: om Port Setup (SII) Programming... P-: Modbus Slave (Server) Programming... P-: Modbus Master Programming (Modbus RTU)... 0 P-: Modbus lient (Modbus TP) Programming... P-: SII Receive Programming... P-: SII Send Programming...
hapter : PL ommunications 0 Introduction This chapter explains the communications ability of the LIK PL system for exchanging data between the PL unit and other connected serial devices. It covers: Electrical connections used for communications Networking routing between the PL and other devices, Setting the port communication parameters, Selecting the protocols and the available data addressing types to use, and Ladder logic program instructions that make it all work together. LIK asic and Standard PLs have two built-in RS- ports. oth ports are -pin RJ phone type jacks. Port communication parameters are fixed and is used primarily as the programming port. Port can also be used as a Modbus RTU protocol slave device. Port is a general purpose port, user configurable, with its communication parameters within LIK Programming Software, 0-PGMSW. Port can be used as a Modbus RTU master or slave protocol device, or handle SII data In or Out (SII stands for merican Standard ode for Information Interchange and defines a character encoding method for text that is used in computers and other communication devices. etails can be found by doing a search for SII on the internet). Standard and nalog PL versions also have a -pin RS- port, Port. Like Port, Port is a general purpose port with its communication parameters being user configurable from the programming software. Port can be used as a Modbus RTU master or slave protocol device, or handle SII data In or Out. LIK Ethernet asic and Standard PL units have one built-in Ethernet communications port and one RS- serial communication port. dditionally, Ethernet Standard PL units have an RS- port. The LIK PL can be networked to other LIK PLs, data input devices (barcode readers, weight scales, etc.), and/or data output devices (serial printers, serial text displays, etc.). It is also possible to network the LIK PL to other rd party PLs and devices that have the ability to communicate using the Modbus RTU protocol. The final part of the PL ommunications chapter contains explanations and examples of the various ways the Send and Receive programming instructions can be used to perform Modbus RTU protocol and SII data communications between devices. There are three different data addressing types that can be selected when using the Modbus RTU protocol from the Send and Receive instructions. They are, LIK addressing, Modbus addressing, or Modbus HEX addressing. The LIK addressing makes it convenient to exchange data between LIK PLs. The other addressing choices are selected based on the Modbus protocol addressing the networked devices are using. For details on the Modbus protocol, visit www.modbus.org. NOTE: The Modbus RTU Master is identified as the device that controls the exchange of data between itself and any connected slave device. There can only be one master on the network. When the LIK PL is the master, it is easily identified. It will be the PL in the network with the Send and/or Receive instructions using the Modbus protocol in its ladder logic program. LIK PL Hardware User Manual, th Edition 0-USER-M
PL ommunication Ports Specifications The LIK PL units have two or three built-in communications ports. om Port om Port om Port Specifications Use: Programming Port Physical: pin, RJ, RS- ommunication speed (baud): 00 (fixed) Parity: Odd Station ddress: ata length: bits Stop bit: Protocol: Modbus RTU (slave only) asic PL om Port Specifications efault Use: Serial ommunication - Physical: pin, RJ, RS- - ommunication speed (baud): 00, 00, 00, 00, 00, 00, 00, 00 00 Parity: odd, even, none Odd Station ddress: to ata length: bits (Modbus RTU) or, bits (SII) bits Stop bit:, Protocol: Modbus RTU (master/slave) or SII in/out Modbus RTU om Port Specifications efault Use: Serial ommunication - Physical: pin, RS- - ommunication speed (baud): 00, 00, 00, 00, 00, 00, 00, 00 00 Parity: odd, even, none Odd Station ddress: to ata length: bits (Modbus RTU) or, bits ( SII) bits Stop bit:, Protocol: Modbus RTU (master/slave) or SII in/out Modbus RTU Port pin RJ Phone Type Jack Port pin RJ Phone Type Jack Port Pin Terminal lock hapter : PL ommunications om Port om Port om Port Standard and nalog PLs Port Pin escriptions 0V Power (-) connection (GN) V Power (+) connection RX Receive data (RS-) TX Transmit data (RS-) N No connection 0V Power (-) connection (GN) Port Pin escriptions 0V Power (-) connection (GN) V Power (+) connection RX Receive data (RS-) TX Transmit data (RS-) RTS Request to send 0V Power (-) connection (GN) Port Pin escriptions + (plus) Signal (RS-) - (minus) Signal (RS-) LG Logic Ground(0 V) 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications PL ommunication Ports Specifications (continued) om Port om Port Ethernet asic PL om Port Specifications Use: Programming and Ethernet ommunication Physical: pin, RJ, Ethernet ommunication Speed (Mbps): 0/00 Protocol: Modbus TP om Port Specifications efault Use: Serial ommunication - Physical: pin, RJ, RS- - ommunication speed (baud): 00, 00, 00, 00, 00, 00, 00 00 Parity: odd, even, none Odd Station ddress: to ata length: bits (Modbus RTU) or, bits (SII) bits Stop bit:, Protocol: Modbus RTU (master/slave) or SII in/out Modbus RTU om Port Specifications efault Use: Serial ommunication - Physical: pin, RS- - ommunication speed (baud): 00, 00, 00, 00, 00, 00, 00 00 Parity: odd, even, none Odd Station ddress: to ata length: bits (Modbus RTU) or, bits ( SII) bits Stop bit:, Protocol: Modbus RTU (master/slave) or SII in/out Modbus RTU Port om Port om Port om Port pin RJ Phone Type Jack Port pin RJ Phone Type Jack Port Pin Terminal lock Ethernet Standard PL Port Pin escriptions TX+ Transmit ata (+) TX- Transmit ata (-) RX+ Receive ata (+) N Not connected N Not connected RX- Receive ata (-) N Not connected N Not connected Port Pin escriptions 0V Power (-) connection (GN) V Power (+) connection RX Receive data (RS-) TX Transmit data (RS-) RTS Request to send 0V Power (-) connection (GN) Port Pin escriptions + (plus) Signal (RS-) - (minus) Signal (RS-) LG Logic Ground(0 V) LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications LE Status Indicators LE Status Indicators There are LE status indicators located to the left of each communication port to indicate port activity or communications. RX and RX (Green) Port & LE Status Indicators TX and TX (Green) On The omm Port is sending data. Off The omm Port is not sending data. On The omm Port is receiving data. Off The omm Port is not receiving data. Port,, & LE Status Indicators TX, TX and TX (Green) On The omm Port is sending data. Off The omm Port is not sending data. RX, RX and RX (Green) On The omm Port is receiving data. Off The omm Port is not receiving data. RUN ERR PORT TX RX TX RX PORT TX RX TX RX PORT PORT TX RX PORT RS- STOP asic PL Standard and nalog PLs irectlogic evices That o Not Work With LIK PLs The LIK PL does not support K-sequence protocol, so the following irectlogic devices do not work with the LIK PL: -HPP -HPP- V-000 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 LE Status Indicators (continued) On Off On Off On Off On Off On link Off On Off Port & LE Status Indicators LNK/T LE (Green) onnected to the network ommunicating isconnected from the network 00MIT LE (Orange) ommunicating at 00Mbps ommunicating at 0Mbps or disconnected from the network TX (Green) The omm Port is sending data. The omm Port is not sending data. RX (Green) The omm Port is receiving data. The omm Port is not receiving data. On link Off On Off Port,, & LE Status Indicators LNK/T LE (Green) onnected to the network ommunicating isconnected from the network 00MIT LE (Orange) ommunicating at 00Mbps ommunicating at 0Mbps or disconnected from the network TX and TX (Green) The omm Port is sending data. The omm Port is not sending data. RX and RX (Green) The omm Port is receiving data. The omm Port is not receiving data. PWR RUN ERR PORT LNK/T ETHER NET 00MIT PORT TX RX RS- RUN ERR PORT LNK/T ETHER NET 00MIT PORT TX RX RS- PORT TX RX RUN R STOPS STOP RS- + _ LG Ethernet asic PLs Ethernet Standard PLs LIK PL Hardware User Manual, th Edition 0-USER-M
Steps to Using the LIK PL ommunications We offer an easy -step method for using the communication features of the LIK PL. Wiring Pages The following pages show the devices that you may connect to the LIK PL om ports. Use the table below to locate information on communications for your particular application. s you can see in the table, each step has subcategories. For each step, find the subcategory description that best describes your application. Use the subcategory references (W-x, -x, and P-x.) to find more information on these topics in this chapter. See the example below. Step Step Wiring Step om Port Setup Step Programming LIK PL ommunications Subcategory Reference Subcategory escription Page W- om port & (RS-) - W- om port (Ethernet) - W- om port (RS-) -0 - om port (RS-) setup - - om port (Ethernet) setup - - om port setup (Modbus RTU) - - om port setup (SII) - - om port setup (Modbus RTU) - - om port setup (SII) - P- Modbus Slave (Server) programming - P- Modbus Master programming (Modbus RTU) -0 P- Modbus lient programming (Modbus TP) - P- SII Receive programming - P- SII Send programming - Example: To connect a barcode reader that sends SII data to om Port : om Port Step Step Step om Port Setup Pages W- - hapter : PL ommunications Refer to these three reference page sections. P- arcode Reader Programming Pages W-x -x P-x 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 Typical ommunication pplications The diagrams on the following four pages illustrate the typical uses for the LIK PL s communication ports. Typical serial communication applications are continued on the next three pages. Port (RS-) Modbus RTU Slave Mode Only asic, Standard and nalog PLs RS- Port Port or Port Port P W- - -more Micro-Graphic panels (monochrome models only) can get V power from RS- Port. Example V-000L serial cable P- nother LIK PL -more Micro-Graphic Panel (Monochrome models only) -more and -more Micro-Graphic Panel Other evices Supporting Modbus RTU Master Mode The olor Micro-Graphic panel or the second Monochrome Micro-Graphic panel needs a separate V power source (see the note below). NOTE: LIK s RS- port can provide V to power one monochrome Micro-Graphic panel. If two -more Micro-Graphic panels are connected to both ports, then at least one of the panels must be powered by a -more Micro power adapter, E-MG-P or E-MG-SP, or another V power source. olor -more Micro-Graphic panels must also be powered from a separate V source. LIK PL Hardware User Manual, th Edition 0-USER-M
Port (Ethernet) Modbus TP ll Ethernet PLs nother LIK Ethernet PL Modbus TP Server (Slave) evices W- - Port SR Soft Starter P- GS rive hapter : PL ommunications Modbus TP lient (Master) evices P -more Panel W- - GS rive ViewMarq isplay nother LIK Ethernet PL Other evices Supporting Modbus TP lient Mode P- Other evices Supporting Modbus TP Server Mode 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 Port (RS-) Modbus RTU or SII arcode Reader ll PLs Serial Printer SII evices that SEN SII messages Weight Scale W- - evices that REEIVE SII messages Serial Text isplay W- - Port Other devices that can send SII data. P- Other devices that can receive SII data. P- P -more and -more Micro-Graphic Panel Modbus RTU Modbus RTU Master evices W- - nother LIK PL nother LIK PL See Note on previous page about connecting a -more Micro-Graphic panel to RS- Port. Other evices Supporting Modbus RTU Master Mode Modbus RTU Slave evices W- - P- Other evices Supporting Modbus RTU Slave Mode P- 0 LIK PL Hardware User Manual, th Edition 0-USER-M
Port (RS- Modbus RTU or SII) hapter : PL ommunications Standard,nalog and Ethernet PL arcode Reader Serial Printer SII evices that SEN SII messages Weigh Scale W- - evices that REEIVE SII messages Serial Text isplay W- - Port Other devices that can send SII data. P- Other devices that can receive SII data. P- P -more and -more Micro-Graphic Panel nother LIK PL Modbus RTU Modbus RTU Master evices W- - nother LIK PL Other evices Supporting Modbus RTU Master Mode Modbus RTU Slave evices SOLO Temperature ontroller W- - P- P- Other evices Supporting Modbus RTU Slave Mode 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 W- pin RJ Phone Type Jack W-: om Port & (RS-) Wiring om Port and om Port have very similar pin layouts; the only difference is that Port has a RTS signal output, which Port does not have. Port Pin escriptions 0V Power (-) connection (GN) V Power (+) connection RX Receive data (RS-) TX Transmit data (RS-) N No connection 0V Power (-) connection (GN) NOTE: oth om ports can provide V; however, the V power can be used only for the -more Micro-Graphic panel. utomationirect does not guarantee that the LIK PL will work correctly when any other device uses V from these om ports. Please also remember these om ports can provide enough power only for one -more Micro-Graphic panel. If you are going to connect a -more Micro-Graphic panel to each om port ( panels in total), you must obtain power from a separate V power source for the second -more Micro-Graphic panel. Wiring Strategy The following pages cover five case scenarios for connecting com ports or to: ase : onnect om Port or to a P. pin RJ Phone Type Jack ase : onnect om Port or to another LIK PL. ase : onnect om Port to a -more or -more Micro-Graphic panel. ase : onnect om Port to an RS- port on another device. Port Pin escriptions 0V Power (-) connection (GN) V Power (+) connection RX Receive data (RS-) TX Transmit data (RS-) RTS Request to send 0V Power (-) connection (GN) ase : onnect om Port to an RS- or RS port on another device(s). LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications ase : onnect om Port or to a P. You can connect om Port or to a serial com port or US port on the P.. onnect to a serial port LIK PL. onnect to a US port LIK PL Serial able P Serial Programming able -SL P to Panel Programming able ssembly (Includes serial & US cables) E-MG-PGM-L US to RS onverter US able P P 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 ase : onnect om Port or to another LIK PL LIK PL You can use cable 0-L. 0-L able In this configuration, one of the LIK PL units needs to be the network master and the other is the network slave. onnect the 0-L on om Port on the master PL unit side. Warning: The ZL-RJ-L- cable cannot be used for this purpose. LIK PL ase : onnect om Port or to a -more or -more Micro-Graphic panel Please use the following cables to make your connections. -more Graphic Panel -more Touch panels -more Micro-Graphic Panels able Part Number E-L (m) or OP-L (m) V-000L if the panel receives V power from the LIK PL com port. (Monochrome panels only; color panels must be powered from a separate V power source. Please refer to the note on page - for details.) E-L (m) or OP-L (m) if the panel receives V power from other source. Port or Port V-000L serial cable -more Micro-Graphic Panel (Monochrome models only) LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications ase : onnect om Port or to an RS- port on another device You need to cross the RT and TX signal lines and connect 0V on both com ports. LIK om Port or 0V 0V RX RX TX TX You can make your own cable. However, we offer two products that make your wiring much easier:. ZIPLink feed-through module and cable LIK PL. ZIPLink pig-tail cable LIK PL ZL-RJ-L- ZL-RJ-L-P RS- Port on nother evice ZL-RT-RJ Pigtail 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 ase : onnect om Port or to an RS- or RS port on another device(s). You need a RS- to RS-/ converter in this case. We recommend our F-ISOON as the converter. LIK PL The recommended cables to connect the F-ISOON to other devices: elden 0 for the RS- elden for -wire RS- elden for -wire RS- able included with F-ISOON F-ISOON onnect to RS-/RS- ports on other devices LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications W- W-: om Port (Ethernet) Wiring om Port (Ehternet) supports 0/00 ase-t Ethernet with an RJ- syle connector. You can use both straight and cross over cables with om Port. Wiring Strategy pin RJ Phone Type Jack Port Pin escriptions TX+ Transmit ata (+) TX- Transmit ata (-) RX+ Receive data (+) N Not connected N Not connected RX- Receive ata (-) N No connection N No connection ase : onnect om Port to a device that supports Modbus TP protocol directly such as a P. ase : onnect om Port to other devices that support the Modbus TP protocol via a switch or hub. ase : onnect om Port to a device that supports the Modbus TP protocol directly such as a P. In this illustration an Ethernet PL unit is connected directly to a P. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 ase : onnect om Port to other devices that support the Modbus TP protocol via a switch or hub. NOTE: om Port can communicate with any number of servers (slaves) using the Receive and/or Send instructions. However, om Port can communicate with up to servers at tthe same time. If the ladder program has sent a message to different servers and tries to send a message to another server, the LIK PL unit disconnects the first server and establishes a connection with the new server, maintaining a total of servers. NOTE: om Port can communicate with up to clients (masters). If a client attempts to establish communication with om Port while it is communicating with clients, the LIK PL unit replies with an error to the forth client. LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications W- W-: om Port Wiring om Port supports -wire RS-. Pin Terminal lock Wiring Strategy You need to connect all + signal terminals in the network together. You will also need to connect all signal terminals together. It is optional to connect the logic ground. + LG LIK om Port RS- Port Pin escriptions + (plus) Signal (RS-) - (minus) Signal (RS-) LG Logic Ground (0 V) RS- Port on another device + LG RS- Port on another device dd a termination resistor between the + and terminals on the last device. Optional (Some devices may not have this terminal.) dd a termination resistor between the + and terminals on Port. NOTE: The resistance of the termination resistors needs to match the impedance of the communication cable. NOTE: Use a repeater if connecting more than slaves to Port. + LG 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 - -: om Port (RS-) Setup om Port has a fixed setup as shown below. This com port works as a Modbus RTU slave only. If you want to connect an external device to this com port, please make sure the external device can be a Modbus RTU master and that the com port setup matches the following setup. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
- -: om Port (Ethernet) Setup Wiring Strategy efore you set up this communication port, you must connect a P loaded with LIK programming software to the LIK PL Port using an Ethernet cable or to the LIK PL Port using a -SL or E-MG-PGM-L programming cable. Refer to hapter : Getting Started for step-by-step instructions on this connection. Once the P and programming software are online with the LIK PL, select the Function tab located in the Navigation window and double click om Port Setup as shown below. Selecct the Function tab, then double click om Prort Setup. The om Port Setup etails dialog box will come into view as shown below Setup the parameters to match your application. hapter : PL ommunications lick the Help button for online om Port Setup etails help. NOTE: The communication port settings are saved in the project file. The project must be transferred to the LIK PL in order for any port setting changes to take effect. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications - -: om Port Setup (Modbus RTU) efore you set up the communication ports you must connect the P with the LIK programming software to the LIK PL Port using a -SL or E-MG-PGM-L programming cable. Refer to hapter : Getting Started for step-by-step instructions for this connection. Once the P and programming software are online with the LIK PL, click the Function tab located in the Navigation window and double click om Port Setup as shown below. Select the Function tab, then double click om Port Setup. Set up the parameters to match other devices in the same network. Make any adjustments here to eliminate om errors. The om Port Setup etails dialog box will come into view as shown below. Select Modbus. lick the Help button for om Port Setup etails online help. Find the asic onfiguration section in the dialog box and set up the parameters to match other devices in the same network. The dialog box also has a section named dvanced onfiguration. You may need to make adjustments to these parameters to overcome communication errors which may occur. IMPORTNT: The communication port settings are saved in the project file. The project must be transferred to the LIK PL in order for any port setting changes to take effect. LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications - -: om Port Setup (SII) efore you set up the communication ports you must connect the P with the LIK programming software to the LIK PL Port using a -SL or E-MG-PGM-L programming cable. Refer to hapter : Getting Started for step-by-step instructions for this connection. Once the P and programming software are online with the LIK PL, click the Function tab located in the Navigation window and double click om Port Setup as shown below. Select the Function tab, then double click om Port Setup. Set up the parameters to match the device connected to Port. Make any adjustments here to eliminate com errors. The om Port Setup etails dialog box will come into view as shown below. Select SII. lick the Help button for om Port Setup etails online help. Find the asic onfiguration section in the dialog box and set up the parameters to match the device connected to Port. The dialog box also has a section named dvanced onfiguration. You may need to make adjustments to these parameters to overcome communication errors which may occur. IMPORTNT: The communication port settings are saved in the project file. The project must be transferred to the LIK PL in order for any port setting changes to take effect. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications - -: om Port Setup (Modbus RTU) efore you set up the communication ports you must connect the P with the LIK programming software to the LIK PL Port using a -SL or E-MG-PGM-L programming cable. Refer to hapter : Getting Started for step-by-step instructions for this connection. Once the P and programming software are online with the LIK PL, click the Function tab located in the Navigation window and double click om Port Setup as shown below. Select the Function tab, then double click om Port Setup. Set up the parameters to match other devices in the same network. Make any adjustments here to eliminate com errors. The om Port Setup etails dialog box will come into view as shown below. Select Modbus. lick the Help button for om Port Setup etails online help. Find the asic onfiguration section in the dialog box and set up the parameters to match other devices in the same network. The dialog box also has a section named dvanced onfiguration. You may need to make adjustments to these parameters to overcome communication errors which may occur. IMPORTNT: The communication port settings are saved in the project file. The project must be transferred to the LIK PL in order for any port setting changes to take effect. LIK PL Hardware User Manual, th Edition 0-USER-M
- -: om Port Setup (SII) efore you set up the communication ports you must connect the P with the LIK programming software to the LIK PL Port using a -SL or E-MG-PGM-L programming cable. Refer to hapter : Getting Started for step-by-step instructions for this connection. Once the P and programming software are online with the LIK PL, click the Function tab located in the Navigation window and double click om Port Setup as shown below. Select the Function tab, then double click om Port Setup. Set up the parameters to match the device connected to Port. hapter : PL ommunications The om Port Setup etails dialog box will come into view as shown below. Find the asic onfiguration section in the dialog box and set up the parameters to match the device connected to Port. Select SII. lick the Help button for om Port Setup etails online help. IMPORTNT: The communication port settings are saved in the project file. The project must be transferred to the LIK PL in order for any port setting changes to take effect. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications P- P-: Modbus Slave (Server) Programming Ladder Program To use a LIK PL as a Modbus slave (server), you don t need any special ladder program. Set up the communication port properly and you just need an End instruction in the ladder program to put the PL in Run mode. However, you can add any additional ladder program to let the slave LIK PL control something by itself. For instance, you may want to shut down the outputs on the slave (server) LIK PL should it lose communication with the Modbus master (client). Note: The Modbus master can communicate with the Modbus slave LIK PL without any ladder program. However, output points on the Modbus slave LIK PL cannot be turned on if the PL is not in the Run mode. ecause of this, we recommend having at least one End instruction and to put the PL in Run mode. Lost ommunication Situation You may want to detect if there is something happening at the Modbus master side that stops communication with the Modbus slaves. Or, the communication cable might have been disconnected. In this situation, you may want the Modbus slaves to take an action. For instance, you may want to shut down the outputs on the slave LIK PL when the communication with the Modbus master is lost. We offer an easy method to accomplish this. The LIK keeps counting how long it has been since each com port received a message from the Modbus master, and enters the time duration in the following system data registers. System ata Registers System ata Register Nickname Range S _Port_No_omm_Time 0 - (sec) S _Port_No_omm_Time 0 - (sec) S _Port_No_omm_Time 0 - (sec) Each register is reset to zero automatically when the com port receives a message from the Modbus master. Then its value increments by per second until the com port receives another message from the Modbus master. If one of these registers has 0 as its value, it means the com port has not received any message from the Modbus master for 0 seconds. You can use this info to shut down the outputs on the slave LIK PL. Here is an example program. This contact is on when com port has not received any message from the Modbus master for 0 seconds. Reset the outputs Y00 to Y00. LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications Modbus ddressing Each of the memory addresses in the LIK (X, S, etc.) has a unique Modbus address. This means the network master in the Modbus network can access any memory address in the slave LIK PL. The best way to check which Modbus address is assigned to a particular LIK memory address is to use the LIK programming software. lick the Program tab located in the Navigation window and double click ddress Picker as shown below. fter the ddress Picker window opens, check the option isplay MOUS ddress on the right bottom. Select the Program tab, then double click ddress Picker. These are the Modbus addresses. The numbers in the parenthesis indicate which function codes can be used for each memory address. heck the option isplay Modbus ddress. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 Exception Response (Exception ode) When the slave LIK PL receives a request from the Modbus master that it cannot respond to, the slave LIK PL sends an exception response to the Modbus master. The LIK PL supports the following Exception Responses. Exception Response (Exception ode) ode Name etails of Exception Response 0 Illegal Function The LIK PL does not support the function code received from the MOUS master. 0 Illegal ata ddress The MOUS master tried to access to an invalid address. 0 Illegal ata Value 0 Slave evice Failure The data length is zero or exceeds the maximum size. The data for Write Single oil is not FF00h (ON) or 0000h (OFF). The PL mode change request from the MOUS master is not valid. Password is locked. When the PL mode switch is in STOP position, the MOUS master requested to switch to RUN mode. When the PL mode switch is in RUN position, the MOUS master requested to switch to the Firmware Update mode. LIK PL Hardware User Manual, th Edition 0-USER-M
P- P-: Modbus Master Programming (Modbus RTU) Instructions The LIK PL has two instructions to exchange data with external Modbus devices through the com ports; the Receive and Send instructions. Receive instruction: Read data from an external Modbus device. Send instruction: Write data to external Modbus device(s). To use these instructions, double click Receive or Send in the Instruction List window as shown below. Select the om Port that you are going to use and confirm the Protocol is MOUS. Select the om Port to use. Protocol needs to be MOUS. hapter : PL ommunications Instruction List ouble click Receive or Send in the Instruction List to use it in the ladder program. If the Protocol is not MOUS, click the om Port Setup button to open the om Port Setup etails window and change the Protocol to MOUS. If the Protocol selection is grayed out as shown below, it means the om Port is used by another Receive and/or Send instruction in the ladder program. You cannot change the Protocol setup until you delete those instructions. Grayed out 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications When you open the Receive or Send instruction in the Modbus mode, their windows should look like this. For the explanation of each setup parameter, please click the Help button on the bottom right. om Port Status Indicators The LIK PL has the following System ontrol Relays to indicate the status of the om Ports. Example Program The ladder program to use these Receive and Send instructions are easy. You just need one NO (Normally Open) contact instruction to check if the com port is ready to receive or send data. When om Port is ready, the Receive instruction is executed. This also applies to the Send instruction. lick the Help button to get detailed information on this setup window. System ontrol Relays ddress Nickname escription S00 _Port Ready_Flag On when Port is ready. S0 _Port Error_Flag On when Port has a communication error. S0 _Port Ready_Flag On when Port is ready. S0 _Port Error_Flag On when Port has a communication error. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications Interlocking These instructions keep receiving or sending data when the enable input is on. If you want to use more than one Receive and/or Send instruction, you need to be sure only one of the instructions is enabled at any point during the operation. The technique to execute more than one Receive and/or Send instruction in order is called Interlocking. When the Interlocking sample program below is executed, the Receive and Send instructions are executed alternatively. Executed when 00 is OFF. Executed when 00 is ON. 00 is turned OFF immediately when the LIK PL starts executing the Send instruction. 00 is turned ON immediately when the LIK PL starts executing the Receive instruction. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 P- P-: Modbus lient (Modbus TP) Programming Instructions The LIK PL has two instructions to exchange data with Modbus servers through the om Port ; the Receive and Send instructions. Receive instruction: Read data from external Modbus server. Send instruction: Write data to external Modbus server(s). To use these instructions, double click Receive or Send in the Instruction List window as shown below. Select om Port that you are going to use. Select om Port Instruction List ouble click Receive or Send in the instruction List to use it in the ladder program. LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications When you open the Receive or Send instruction in the Modbus mode, their windows should look like this. For the explanation of each setup parameter, please click the Help button on the bottom right. lick the Help button to get detailed information on this setup window. om Port Status Indicators The LIK PL has the following System ontrol Relays to indicate the status of om Port. System ontrol Relays ddress Nickname escription S0 _Port Ready_Flag ON when Port is ready. S _Port Error_Flag ON when Port has a communication error. S _Port lients_limit ON when Port is communicationg with clients. S _Port IP_Resolved ON when Port obtains an IP address. S _Port Link_Flag ON when Port is connected to an Ethernet netwrok. S _Port 00MIT_Flag ON when Port is communicationg at 00Mbps. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 Example Program The ladder program to use these Receive and Send instructions are easy. You just need one NO (Normally Open) contact instruction to check if the com port is ready to receive or send data. When om Port is ready, the Receive instruction is executed. This also applies to the Send instruction. Interlocking These instructions keep receiving or sending data when the enable input is on. If you want to use more than one Receive and/or Send instruction, you need to be sure only one of the instructions is enabled at any point during the operation. The technique to execute more than one Receive and/or Send instruction in order is called Interlocking. Here is an example of interlocking. When this sample program is executed, the Receive and Send instructions are executed alternatively. Executed when 00 is OFF. Executed when 00 is ON. 00 is turned OFF immediately when the LIK PL starts executing the Send instruction. 00 is turned ON immediately when the LIK PL starts executing the Receive instruction. LIK PL Hardware User Manual, th Edition 0-USER-M
P- P-: SII Receive Programming Instruction The Receive instruction allows the LIK PL to read SII message from an external device. To use this instruction, double click Receive in the Instruction List window as shown below. Select the om Port that you are going to use and confirm the Protocol is SII. Select the om Port to use. Protocol needs to be SII. hapter : PL ommunications Instruction List ouble click Receive in the Instruction List to use it in the ladder program. If the Protocol is not SII, click the om Port Setup button to open the om Port Setup etails window and change the Protocol to SII. If the Protocol selection is grayed out as shown below, it means the om Port is used by another Receive and/or Send instruction in the ladder program. You cannot change the Protocol setup until you delete those instructions. Grayed out 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 When you open the Receive instruction in the SII mode, the window should look like this. For the explanation of each setup parameter, please click the Help button on the bottom right lick the Help button to get the detailed information of this setup window. Example : Read SII message from a barcode reader. With the following example program, when is ON, the Receive instruction is activated and om Port waits for an SII message from the barcode reader. When om Port receives an SII message and it includes the termination character (R = arriage Return in this example), is turned on and the received SII message is copied to TXT address. LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications TXT TXT TXT opied R S0 System ata Register S0 stores the number of received characters for Port. arcode Reader Example : Retrieve numerical data from the received SII message. When numerical data is included in the received SII message, you may want to retrieve the numerical data and copy into a data register. The opy instruction can be used for this purpose. In this example, received SII message is stored in TXT to TXT. This SII message includes a numerical data. as SII characters from TXT to TXT. The opy instruction converts those SII characters into the equivalent numerical data and copies into data register F. TXT TXT TXT TXT. TXT TXT onverted & opied F. Use Pack Mode 0 LIK PL Hardware User Manual, th Edition 0-USER-M
0 hapter : PL ommunications P- P-: SII Send Programming Instruction The Send instruction allows the LIK PL to send SII messages to an external device. To use this instruction, double click Send in the Instruction List window as shown below. Select the om Port that you are going to use and confirm the Protocol is SII. Select the om Port to use. Protocol needs to be SII. Instruction List ouble click Send in the Instruction List to use it in the ladder program. If the Protocol is not SII, click the om Port Setup button to open the om Port Setup etails window and change the Protocol to SII. If the Protocol selection is grayed out as shown below, it means the om Port is used by another Receive and/or Send instruction the ladder program. You cannot change the Protocol setup until you delete those instructions. Grayed out LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications When you open the Send instruction in the SII mode, the window should look like this. For the explanation of each setup parameter, please click the Help button on the bottom right. lick the Help button to get detailed information on this setup window. Example: Send SII message to a serial printer. With the following example program, when status of changes from OFF to ON, the Send instruction sends SII message and the termination character (R = arriage Return in this example). is turned on when sending the SII message is completed. 0 LIK PL Hardware User Manual, th Edition 0-USER-M
hapter : PL ommunications 0 Notes: 0 LIK PL Hardware User Manual, th Edition 0-USER-M