1 Application Description Objective Goals... 3

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1 Contents Moxa Technical Support Team 1 Application Description Objective Goals System Topology Hardware and Software Requirements Configuration Hardware Installation PowerFlex 4M Settings IAQPoint2 Settings Settings Configuring Siemens PLC Creating the STEP 7 project Inserting a Station Configuring Hardware Creating a PROFIBUS network Installing the GSD file Configuring the PROFIBUS Slave Configuring I/O Modules Editing Symbols Configuring Ethernet Nodes...25 Copyright 2014 Moxa Inc. Released on December 26, 2014 About Moxa Moxa is a leading manufacturer of industrial networking, computing, and automation solutions. With over 25 years of industry experience, Moxa has connected more than 30 million devices worldwide and has a distribution and service network that reaches customers in more than 70 countries. Moxa delivers lasting business value by empowering industry with reliable networks and sincere service for automation systems. Information about Moxa s solutions is available at You may also contact Moxa by at info@moxa.com. How to Contact Moxa Tel: Fax:

2 5.10 Downloading Configuration Step 7 Ladder Programming Editing OB Communication Test: Monitor Program Appendix PowerFlex 4M Modbus Registers IAQPoint2 Modbus Registers...35 Copyright 2014 Moxa Inc. Page 2 of 35

3 1 Application Description 1.1 Objective This document describes an application using Siemens PLC with. In this application, Siemens PLC is used to get input data that polls from the temperature meter through Modbus Register. Siemens PLC evaluates the temperature value and outputs data to, which then uses the data to control speed. 1.2 Goals In this document, you will learn the following: Configure Siemens PLC. Configure to communicate with a Modbus RTU device. Set up in SIMATIC Step 7. Create a basic Step 7 Ladder Programming. Industrial field applications and the job of each role. 2 System Topology The following figure shows a system architecture in which the Modbus end devices, PowerFlex 4M and IAQPoint2, are connected to the serial port on through RS-485-2W wiring. is connected to the PROFIBUS port on Siemens PLC via a PROFIBUS cable. PC (running SIMATIC Step 7) is connected to an Ethernet switch port on Siemens PLC via an Ethernet cable. A fan is connected to PowerFlex 4M, which powers the fan. Copyright 2014 Moxa Inc. Page 3 of 35

4 PC (SIMATIC Step 7) Information Level Ethernet Control Level Siemens S7 PLC CPU PN/DP PROFIBUS Device Level RS-485-2W Power Flex 4M Fan IAQPoint2 3 Hardware and Software Requirements Siemens SIMATIC S7-300 PLC Processor: CPU PN/DP Article Number: 6ES7315-2EH14-0AB0 Version:3.2.7 Firmware Version: Ver1.3_Build_ EDS File: MPBS0D80.gsd PowerFlex 4M PowerFlex 4M is an adjustable frequency AC drive that is used to drive the fan in this application. IAQPoint2 IAQPoint2 is an indoor air quality monitor. It can detect CO2, temperature, and humidity Copyright 2014 Moxa Inc. Page 4 of 35

5 levels. SIMATIC Step7 Siemens PLC Engineering Software released by Siemens AG. Version : V5.5+SP3 MGate Manager Software utility to configure a Moxa MGate device. Version : Configuration 4.1 Hardware Installation PowerFlex 4M and IAQPoint2 Connection RS-485-2W wiring Pin assignment Modbus Port 5 6 Copyright 2014 Moxa Inc. Page 5 of 35

6 PLC Connection Siemens S7 PLC CPU PN/DP Ethernet Cable PROFIBUS Cable PC (SIMATIC Step 7) 4.2 PowerFlex 4M Settings Serial Port Settings Baudrate: Set on panel: Command C302 (Comm Data Rate), option 5 Options (Default) K K Data bit, Parity, Stop bit :8-E-1 Set on panel: Command C306 (Comm Format), option 1 Options 0 RTU 8-N-1 (Default) 1 RTU 8-E-1 2 RTU 8-O-1 3 RTU 8-N-2 4 RTU 8-E-2 5 RTU 8-O-2 Copyright 2014 Moxa Inc. Page 6 of 35

7 Programmable Settings Start Source: Modbus port Set on panel: Command P106 (Start Source), option 5 Options 0 Keypad (Default) 1 3-Wire 2 2-Wire 3 2-W Lvl Sens 4 2-W Hi Speed 5 Comm Port Speed Reference: Modbus port Set on panel: Command P108 (Speed Reference), Option 5 Options 0 Drive Pot (Default) 1 InternalFreq V Input mA Input 4 Preset Freq 5 Comm Port Modbus Slave ID Setting: 100 (default) 4.3 IAQPoint2 Settings Serial Port Settings Use the touch panel (the default access password is 2967) to configure the following settings for the serial port: Baudrate: Parity: Even (Default) Address (Slave ID): 1 (Default) 4.4 Settings Assigning a PROFIBUS Address Before a PROFIBUS slave can communicate with a PROFIBUS master, you must assign an address to the PROFIBUS slave. Make sure that you assign the same address that you set Copyright 2014 Moxa Inc. Page 7 of 35

8 in the STEP 7 project. You can use the rotary switch (as shown in the following figure) to set an address that is between 0 and 99. To assign an address larger than 99, use the MGate Manager. Device Configuration Using MGate Manager This section shows you how to configure. 1. Connect a COM port on PC to the serial console on. Copyright 2014 Moxa Inc. Page 8 of 35

9 2. Start MGate Manager and search for the device. 3. Select the target device and click Configuration. Copyright 2014 Moxa Inc. Page 9 of 35

10 4. Select the Modbus tab and configure the fields as shown in the following figure. Copyright 2014 Moxa Inc. Page 10 of 35

11 5. Select the PROFIBUS tab. The screen displays the address value that you set using the rotary switch. 6. Select the IO Mapping tab and configure the fields as shown in the following figures. Modbus Commands Note: For more information on Modbus registers for PowerFlex and IAQPoint 2, refer to the appendix. Copyright 2014 Moxa Inc. Page 11 of 35

12 IO Module 7. Click OK. automatically restarts to make the changes take effect. 5 Configuring Siemens PLC Follow the procedures in this section to configure Siemens PLC. 5.1 Creating the STEP 7 project Start SIMATIC Manager and create a new project. Click File > New. Then, set the project name in the Name field and click OK. Copyright 2014 Moxa Inc. Page 12 of 35

13 5.2 Inserting a Station In SIMATIC Manager, click Insert > Station and select to insert SIMATIC 300 Station into the project. Copyright 2014 Moxa Inc. Page 13 of 35

14 5.3 Configuring Hardware Adding a Rack 1. In SIMATIC Manager, double-click Hardware. 2. The HW Config screen appears. Click Insert > SIMATIC 300 > RACK > Rail to insert the rack object Copyright 2014 Moxa Inc. Page 14 of 35

15 The following figure shows the HW Config screen after adding the rack object. Copyright 2014 Moxa Inc. Page 15 of 35

16 5.3.2 Adding a CPU You must add the appropriate CPU module to the STEP7 project based on the actual hardware model. In this example, CPU PN/DP is the hardware model. In the HW Config screen, drag the selected CPU module to the table. The following figure shows a screen example after adding the CPU module. Copyright 2014 Moxa Inc. Page 16 of 35

17 5.4 Creating a PROFIBUS network 1. Double-click MPI/DP to configure the PROFIBUS DP module. 2. In the Properties screen, in the Interface area, select PROFIBUS from the Type drop-down list box and click Properties. Copyright 2014 Moxa Inc. Page 17 of 35

18 3. Click the Parameters tab to set the address for the PROFIBUS master. Select a value from the Address drop-down list. Then, click New to create a new subnet. 4. In the Network Settings tab, select an option for the Transmission Rate setting and select DP for the Profile setting; then, click OK. Copyright 2014 Moxa Inc. Page 18 of 35

19 5. In the Operating Mode tab, select the DP master operating mode and click OK. Copyright 2014 Moxa Inc. Page 19 of 35

20 The following figure shows an example screen that indicates that the PROFIBUS network is configured successfully. 5.5 Installing the GSD file For engineering and configuration purposes, you must install a device GSDML file using the SIMATIC Manager. 1. In the HW Config screen, click Options > Install GSD File. Copyright 2014 Moxa Inc. Page 20 of 35

21 2. In the Install GSD Files screen, click Browse to navigate to the folder and select the GSDML file for the Moxa PROFINET device. Then, click Install and Close. Copyright 2014 Moxa Inc. Page 21 of 35

22 If the GSD file is installed successfully, the system displays Moxa PROFBUS Slave in the hardware catalog list. 5.6 Configuring the PROFIBUS Slave 1. In the HW Config screen, select and drag the Moxa Profibus Slave device to DP master system. 2. Right-click Moxa Profibus Slave and select Object Properties. 3. In the Parameters tab, you can configure the PROFIBUS address of the Moxa device. Make sure that the address is the same address that you set using the rotary switch Note: on the PROFIBUS slave. Copyright 2014 Moxa Inc. Page 22 of 35

23 5.7 Configuring I/O Modules You can configure the selected I/O modules for data exchange with the PROFIBUS master. You can select the I/O module combinations based on your application. This example uses the two 1 Word output and one 1 Word input IO combination 1. Drag the Output: 1 Word module from the module list for Moxa PROFINET slave to slots 1 and Drag the Input: 1 Word module to slot Save the changes. Copyright 2014 Moxa Inc. Page 23 of 35

24 5.8 Editing Symbols 1. Right-click slot 1 entry and select Edit Symbols. 2. Set the Symbol field as QCMD and set the Comment field as Output Logic Command. 3. Edit the symbols for slots 2 and 3 as shown in the following figures. Copyright 2014 Moxa Inc. Page 24 of 35

25 5.9 Configuring Ethernet Nodes Before you can download the configuration to CPU PN/DP, specify the Ethernet settings on CPU PN/DP to communicate with PC. To change the IP address of CPU PN/DP, double-click PN-IO. Then, click Properties and specify the network settings (IP address and subnet mask). The following figure shows an example Downloading Configuration To download the configuration to CPU PN/DP, click the Download to Module icon. Copyright 2014 Moxa Inc. Page 25 of 35

26 Copyright 2014 Moxa Inc. Page 26 of 35

27 Siemen PLC starts to communicate with. The P2 Status LED (PROFIBUS) on turns steady green to indicate that the device is in data exchange mode. 6 Step 7 Ladder Programming 6.1 Editing OB1 1. In SIMATIC Manager, click S7 Program->Blocks and double-click OB1. As a Program Cycle Organization Block, OB1 is executed at regular intervals by the S7 CPU operating system after the startup process is complete. Copyright 2014 Moxa Inc. Page 27 of 35

28 The following screen appears. 2. Drag and drop the MOVE instruction to Network 1. Then, set the ITemperature input to the IN node and the input MW0 memory variable to the OUT node. The logic comment for Network 1 is Copy temperature value to MW0. as shown in the following figure. Copyright 2014 Moxa Inc. Page 28 of 35

29 3. Complete the following steps to configure Network 2: a. Click Insert > Network to insert Network 2. b. Drag and drop the MOVE instruction to Network 2. Then, set the 2 input to the IN node and the QMD input symbol to the OUT node. The logic comment for Network 2 is Output 2 (Start Mode) to "Logic Command" word. as shown in the following figure. 4. Complete the following steps to configure Network 3: a. Click Insert > Network to insert Network 3. b. Drag and drop the GE_I instruction to Network 3. Then, set the MW0 input to the IN1 node and the 250 input to the IN2 node. c. Drag and drop the Move instruction to Network 3. Then, set the 600 input to the IN node and the QSpeed input symbol to the OUT node The logic comment for Network 3 is If Temperature is greater than 25C, output drive speed as 60 MHz. as shown in the following figure. Copyright 2014 Moxa Inc. Page 29 of 35

30 5. Complete the following steps to configure Network 4: a. Click Insert > Network to insert Network 3. b. Drag and drop the GE_I instruction to Network 4. Then, set the MW0 input to the IN1 node and the 245 input to the IN2 node. c. Drag and drop the LI_1 instruction to Network 4. Then, set the MW0 input to the IN1 node and the 250 input to the IN2 node. d. Drag and drop the MOVE instruction to Network 4. Then, set the 500 input to the IN node and the QSpeed input symbol to the OUT node. The logic comment for Network 4 is If Temperature is between 24.5~25C,output drive speed as 50 MHz. as shown in the following figure. Copyright 2014 Moxa Inc. Page 30 of 35

31 The following table shows the logic of Network 3~9. Network Temperature (C ) >= < Drive Speed (MHz.) Click Download to download the program to Siemen PLC. 7 Communication Test: Monitor Program In the OB1 program, click Debug > Monitor. Copyright 2014 Moxa Inc. Page 31 of 35

32 In the following example, the title bar indicates the program status (ONLINE). The status bar indicates the Siemen PLC status (RUN). The temperature is 23.1 C and the output speed is 20MHz for Network 7. 8 Appendix 8.1 PowerFlex 4M Modbus Registers Logic Command Register Address: 8192 Access: R/W Value: Bit(s) Description 0 1 = Stop, 0 = Not Stop 1 1 = Start, 0 = Not Start Reference Register: Setting Speed Address: 8193 Access: R/W Value: A decimal value entered as xxx.x where the decimal point is fixed. For example, a decimal of 100 equals to 10.0 Hz and 543 equals to 54.3 Hz. Copyright 2014 Moxa Inc. Page 32 of 35

33 Logic Status Register Address: 8448 Access: R Value: Bit(s) Description 0 1 = Ready, 0 = Not Ready 1 1 = Active (Running), 0 = Not Active 2 1 = Cmd Forward, 0 = Cmd Reverse 3 1 = Rotating Forward, 0 = Rotating Reverse 4 1 = Accelerating, 0 = Not Accelerating 5 1 = Decelerating, 0 = Not Decelerating 6 1 = Alarm, 0 = No Alarm 7 1 = Faulted, 0 = Not Faulted 8 1 = At Reference, 0 = Not At Reference 9 1 = Reference Controlled by Comm 10 1 = Operation Cmd Controlled by Comm 11 1 = Parameters have been locked 12 Digital Input 1 Status 13 Digital Input 2 Status 14, 15 Not Used Feedback Register: Running Speed Address: 8451 Access: R Value: A xxx.x decimal value where the decimal point is fixed. For example, a decimal of 123 equals to 12.3 Hz and 300 equals to 30.0 Hz. Copyright 2014 Moxa Inc. Page 33 of 35

34 Drive Error Codes Register Address: 8449 Access: R Value: Value (Decimal) Description 0 No Fault 2 Auxiliary Input 3 Power Loss 4 Under Voltage 5 Over Voltage 6 Motor Stalled 7 Motor Overload 8 Heat Sink Over Temperature 12 HW Overcurrent (300%) 13 Ground Fault 29 Analog Input Loss 33 Auto Restart Tries 38 Phase U to Ground Short 39 Phase V to Ground Short 40 Phase W to Ground Short 41 Phase UV Short 42 Phase UW Short 43 Phase VW Short 63 Software Overcurrent 64 Drive Overload 70 Power Unit Fail 80 AutoTune Fail 81 Communication Loss 100 Parameter Checksum Error 122 I/O Board Fail Copyright 2014 Moxa Inc. Page 34 of 35

35 8.2 IAQPoint2 Modbus Registers Gas Display Register (CO2) Address: 101 Access: R Value: This reports gas concentration. If the CO2 sensor is fitted, this will report in ppm from 0 to Temperature C Register Address: 102 Access: R Value: This reports temperature in tenths of a degree Celsius. Humidity Register Address: 103 Access: R Value: This reports the relative humidity in percentages from 0 to 100. Copyright 2014 Moxa Inc. Page 35 of 35