Applications & Tools. Control and Status Check of the digital Output of a SCALANCE W748-1 via S7 PN-CPU and SNMP Library

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1 Cover Control and Status Check of the digital Output of a SCALANCE W748-1 via S7 PN-CPU and SNMP Library SIMATIC S7 PN-CPUs, SCALANCE W700 Application Description April 2012 Applications & Tools Answers for industry.

2 Siemens Industry Online Support This document is taken from Siemens Industry Online Support. The following link takes you directly to the download page of this document: Caution The functions and solutions described in this entry predominantly confine themselves to the realization of the automation task. Please also take into account that corresponding protective measures have to be taken in the context of Industrial Security when connecting your equipment to other parts of the plant, the enterprise network or the Internet. For more information, please refer to Entry ID If you have any questions concerning this document please us to the following address: Please also actively use our technical forum from Siemens Industry Online Support regarding this subject. Share your questions, suggestions or problems and discuss them with our strong forum community: 2 V1.0, Entry ID:

3 s Problem 1 Solution 2 SNMP Basics 3 SIMATIC Control and Status Check of the digital Output of a SCALANCE W748-1 Functional Mechanisms of this Application 4 Installation 5 Commissioning of the Application 6 Operation of the Application 7 Glossary 8 References 9 History 10 V1.0, Entry ID:

4 Warranty and Liability Warranty and Liability Note The application examples are not binding and do not claim to be complete regarding the circuits shown, equipping and any eventuality. The application examples do not represent customer-specific solutions. They are only intended to provide support for typical applications. You are responsible for ensuring that the described products are correctly used. These application examples do not relieve you of the responsibility of safely and professionally using, installing, operating and servicing equipment. When using these application examples, you recognize that Siemens cannot be made liable for any damage/claims beyond the liability clause described. We reserve the right to make changes to these application examples at any time without prior notice. If there are any deviations between the recommendations provided in these application examples and other Siemens publications e.g. Catalogs then the contents of the other documents have priority. We do not accept any liability for the information contained in this document. Any claims against us based on whatever legal reason resulting from the use of the examples, information, programs, engineering and performance data etc. described in this application example shall be excluded. Such an exclusion shall not apply in the case of mandatory liability, e.g. under the German Product Liability Act ( Produkthaftungsgesetz ), in case of intent, gross negligence, or injury of life, body or health, guarantee for the quality of a product, fraudulent concealment of a deficiency or breach of a condition which goes to the root of the contract ( wesentliche Vertragspflichten ). However, claims arising from a breach of a condition which goes to the root of the contract shall be limited to the foreseeable damage which is intrinsic to the contract, unless caused by intent or gross negligence or based on mandatory liability for injury of life, body or health. The above provisions do not imply a change in the burden of proof to your detriment. It is not permissible to transfer or copy these application examples or excerpts of them without first having prior authorization from Siemens Industry Sector in writing. 4 V1.0, Entry ID:

5 Table of Contents Table of Contents Warranty and Liability Problem Solution Overview of the overall solution Description of the core functionality Scenario: Switching the digital output Scenario: Checking the status of the digital output Hardware and software components used SNMP Basics What is SNMP? Management Information Base MIB Device profiles Functional Mechanisms of this Application Program overview Scenario: Switching the digital output Diagram for the Switching the digital output scenario Program details for the Switching/switching off the digital output scenario Scenario: Checking the status of the digital output Diagram for the Checking the status of the digital output scenario Program details for the Checking the status of the digital output scenario Error and status display Installation Hardware configuration of the S7 station Hardware configuration of the SCALANCE W748-1 RJ Installing the software Commissioning of the Application Installing the application software Setting the PG/PC interface Configuring the PC/PG Configuring the S7 station Configuring the SCALANCE W748-1 RJ Downloading the STEP 7 project Operation of the Application Overview Controlling the digital output Switching the digital output on Switching the digital output off Checking the status of the digital output Glossary References References Internet links History...41 V1.0, Entry ID:

6 1 Problem 1 Problem Introduction To save energy, the I/O operated on a monorail conveyor is to be switched off when the monorail conveyor is, for example, inactive in a parking position. Overview of the automation problem The figure below provides an overview of the automation problem. Figure 1-1 S7 CPU Industrial Ethernet ON/OFF I/O IWLAN_Client Access Point Industrial Ethernet Distributed I/O 24V 6 V1.0, Entry ID:

7 2 Solution 2 Solution 2.1 Overview of the overall solution Introduction In this application example, the switching operations are realized on the new IWLAN clients. A SIMATIC S7 CPU with PROFINET interface, as a simple SNMP Manager, can perform the following functions: Read in the status of the digital output of the IWLAN client switch the digital output. Diagrammatic representation The diagrammatic representation below shows the most important components of the solution with an S7-300 PN-CPU. Alternatively, the solution can also be implemented with another PN-CPU that supports UDP (see \3\). Figure 2-1 User program with status check, switching block (SWITCH_IO) GET/SET block from SNMP library (SNMP_GET, SNMP_SET) CPU PN/DP SCALANCE W748-1 RJ45 2x ANT795-6MT Signaling column (visualizes the switching operation) MIB PROFINET I/O Components included Table 2-1 Hardware components No. Component Description 1 S7 PN-CPU An S7-300, S7-400 or ET 200S CPU that supports UDP via open communication. 2 Industrial Ethernet twisted pair cable CPU and SCALANCE W are connected by an Industrial Ethernet twisted pair cable. 3 SCALANCE W700 A SCALANCE W748-1 RJ45 (client). A SCALANCE W access point can also be used (see \4\). 4 External antennas ANT795-6MT 5 Signaling column A signaling column to monitor the digital output of the IWLAN client. V1.0, Entry ID:

8 2 Solution Table 2-2 Software components Block Function Comment FB SWITCH_IO Switches the digital output with the SNMP library block FB SNMP_SET Checks the status of the digital output with the SNMP library block FB SNMP_GET Individual user block in SCL FB CALL_SWITCH_IO Calls the FB SWITCH_IO Individual block in FBD FB SNMP_SET Modifies an SNMP variable Universal SNMP library block FB SNMP_GET Queries an SNMP variable Universal SNMP library block Scope This application does not include the basics of Validity the LAD/FBD/STL/SCL programming languages IWLAN. Basic knowledge of these topics is required. The application does not go into PROFINET functions for deactivating/activating IO devices using the IO controller (SFC12). These functions must always first be called in the user program before the IO device is disconnected from the power supply. Otherwise, the S7 CPU will go to STOP mode (see \5\). All current PROFINET CPUs from the SIMATIC product range that support UDP (see \3\) STEP 7 V5.5 SCALANCE W788-x/W748-x, RJ45 variant 8 V1.0, Entry ID:

9 2 Solution 2.2 Description of the core functionality In this example, the required scenarios are implemented with a user block programmed in SCL, FB SWITCH_IO (FB102), and with the aid of the universal SNMP library blocks (FB SNMP_SET and FB SNMP_GET) Scenario: Switching the digital output Figure 2-2 Switching the digital output SNMP_control IWLAN client ON_dig_OUT SNMP_PACKET Write job OFF_dig_OUT READ_dig_OUT MIB SNMP_variables IP_address DEVICE_ID. SET, RESET When the S7 CPU detects, for example, the parking position of a monorail conveyor, a SET SNMP packet will be generated and a write job will be transmitted to the IWLAN client. A GetResponse response message receives the result of the write job from the IWLAN client. If the read-in variable matches the setpoint, the switching operation was successful Scenario: Checking the status of the digital output Figure 2-3 Checking the status of the digital output SNMP_status_check IWLAN client ON_dig_OUT OFF_dig_OUT READ_dig_OUT SNMP_PACKET Read job MIB SNMP_variables IP_address DEVICE_ID.. Status check V1.0, Entry ID:

10 2 Solution In this scenario, you query the value of the digital output of the IWLAN client. For this purpose, you send a read job to the IWLAN client with the aid of the FB SWITCH_IO user block (FB102). The IWLAN client responds to the query with a GETResponse message that receives the desired status. Advantages of these solutions The solutions presented here offer you the following advantages: The FB SWITCH_IO block (FB102) enables an S7 CPU to activate switching operations on the new IWLAN APs/clients, which could otherwise only be implemented by large network management systems (e.g., SINEMA Server). The code of the FB SWITCH_IO block can be used as a basis and adjusted to your individual switching and query scenarios. 10 V1.0, Entry ID:

11 2 Solution 2.3 Hardware and software components used The application was created with the following components: Hardware components Table 2-3 Component Qty. MLFB/order number Note PS307 5A 1 6ES7307-1EA00-0AA0 CPU PN/DP 1 6ES7315-2EH14-0AB0 Alternatively, another S7 PN-CPU that supports UDP can also be used. Micro Memory Card 1 6ES7953-8LF11-0AA0 Industrial Ethernet twisted pair cable SCALANCE W748-1 RJ XV GH60 For the communication between controller and SCALANCE W GK5748-1FC00-0AA0 External antennas 2 ANT795-6MT You can use one or three antennas. However, you have to adjust the antenna configuration in WBM (see \4\). Standard software components Table 2-4 Component Qty. Order number STEP 7 V5.5 SP2 1 6ES7810-4CC08-0YA5 S7-SCL V5.3+SP5 1 6ES7811-1CC05-0YA5 Sample files and projects The following list contains all files and projects that are used in this example. Table 2-5 Component _SCAL_W_IO_SNMP_S7_CPU_CODE_V1_0.zip Note This zip file contains the complete user program _SAL_W_IO_SNMP_S7_CPU_DOKU_V1_0_en.pdf This document. V1.0, Entry ID:

12 3 SNMP Basics 3 SNMP Basics What is SNMP? SNMP Simple Network Management Protocol is a UDP-based protocol that was specified specifically for the administration of data networks and has established itself as the de facto standard for TCP/IP devices. The individual nodes in the network network components or also terminal units feature a so-called SNMP agent that provides information in a structured form. This structure is referred to as MIB Management Information Base. In the network node, the agent is usually implemented as a firmware functionality. The figure below shows the data flow for SNMP. Figure 3-1 Cyclic data communication controlled by manager Event-controlled by agent A network management solution based on SNMP operates according to the client/server model. The management station (SNMP client) can poll information from the agents to be controlled that act as servers. The MIB information is polled cyclically by the management station and visualized if necessary. In addition, the nodes are also able to report specific statuses to the network management station on an unsolicited basis via so-called traps. With SNMP, it is not only possible to monitor the nodes, but instructions for controlling the devices are also possible. This includes, for example, the activation or deactivation of a port on a network component. 12 V1.0, Entry ID:

13 3 SNMP Basics Communication between the agent and the network management station takes place in the background and only places a minor load on the network Management Information Base MIB An MIB (Management Information Base) is a standardized data structure made up of different SNMP variables that are written in a language that is independent of the target system. Due to the cross-vendor standardization of MIBs and access mechanisms, even a heterogeneous network can be monitored and controlled with components from different manufacturers. If component-specific, non-standardized data is necessary for network monitoring, this data can be described by the manufacturers in so-called private MIBs. Figure 3-2 Standardized data System information such as network statistics, counters, tables Extended standardized data E.g., data on network load (TMON) for switches Device-specific data E.g., status of the redundant power supply Bridge MIB E.g., topological view using an Office tool An MIB describes the entirety of all SNMP objects (SNMP variables) in the network. The structure of the MIB information is similar to the one of the Windows Registry. V1.0, Entry ID:

14 3 SNMP Basics The figure below shows the structure of the standard MIB (MIB-2): Figure 3-3 The OID (object identifier) describes the address of the MIB object. For standardized MIB objects, the address is predefined. Private MIB objects are always stored in the Enterprise directory. The addresses within this structure are set by the manufacturer. Only the manufacturer number must be registered Device profiles A device profile describes the scope of the variables of a device, for example the SCALANCE X208, that are displayed on the OPC server. Only variables included in the device profile can be integrated into an application. The SNMP OPC server additionally includes a so-called MIB compiler that is used to adjust existing device profiles or to create new device profiles. This is done by entering the required SNMP variables from the public and, if necessary, private MIBs in the profile. SIMATIC devices with special SNMP agents such as switches (SCALANCE X, SCALANCE W), the CP1616 Industrial Ethernet communications processor, CP443-1, etc. are already included in the STEP 7 directory with their device profiles. For IP-capable devices that do not have their own SNMP agent, the SNMP manager can at least determine the IP address and the status of the connection to this network node using the ping status check common in TCP/IP and make this information available to the SNMP OPC server. Note The device profiles compiled beforehand are located in the following directory: <STEP 7 installation directory>/s7data/snmp/profile 14 V1.0, Entry ID:

15 4 Functional Mechanisms of this Application 4 Functional Mechanisms of this Application Introduction The following sections provide detailed explanations of the following functions: Switch the digital output Check the status of the digital output 4.1 Program overview Diagrammatic representation The figure below shows the program structure of the entire STEP 7 project. Figure 4-1 FB93 CALL_SWITCH_IO SNMP_GET FC2, FC4, FC11, FC17, FC20, FC21,FC26, FC32, FC37, FC38 OB 1 SWITCH_IO OB CALL CALL_SWITCH _IO FB 102 Call SNMP_GET + SNMP_SET FB SNMP_SET FB 101 FB TCON IEC functions Communication blocks FB FB FB TUSEND TURCV TDISCON Individual user block SNMP library blocks S7 standard library blocks V1.0, Entry ID:

16 4 Functional Mechanisms of this Application FB SWITCH_IO parameters The following figure and table show the call interface of the core user block FB SWITCH_IO (FB102). Figure 4-2 Table 4-1 Symbol Data type Explanation EN BOOL Enable input. Relevant only in FBD and LAD representation. ON_dig_OUT BOOL Sets the digital output of the device to logical 1 Reacts only to a positive edge OFF_dig_OUT BOOL Sets the digital output of the device to logical 0 Reacts only to a positive edge READ_dig_OUT BOOL Checks the status of the digital output INPUT_PARAM STRUCT Via the INPUT_SWITCH UDT, it contains the parameters of the UDP connection (see Figure 4-3): IP address (DWORD) CON_ID (WORD) Device_Id (BYTE) DONE BOOL TRUE when the last job has been completed without errors. Set to TRUE for only one cycle. BUSY BOOL Set to TRUE when the SWITCH_IO block is active. Set to the FALSE status as soon as the operation is completed or an error occurs. STATUS_dig_OUT BOOL Status of the digital output of the last action TRUE: Digital output ON FALSE : Digital output OFF 16 V1.0, Entry ID:

17 4 Functional Mechanisms of this Application INPUT_PARAM structure Symbol Data type Explanation ERROR BOOL TRUE if an error occurs when executing the routine. Set to TRUE for only one cycle. Default value: FALSE STATUS DWORD Status if ERROR=TRUE For only one cycle ENO BOOL Enable output. Relevant only in FBD and LAD representation. Figure 4-3 INPUT_SWITCH UDT The data relevant to communication, IP address of the IWLAN client, DEVICE_ID of the S7 CPU type and CON_ID: necessary connection ID for the UDP connection, is stored in the DB SWITCH_SET_GET global data block that contains the data structure from the INPUT_SWITCH UDT. Figure 4-4 Data view: DB SWITCH_SET_GET General variables The data important for communication and packet generation, Local port Community name, is included in the IDB_SWITCH_IO instance data block. Figure 4-5 IDB_SWITCH_IO The parameters that have fixed values for this application, OID for the digital output, Value_SET and Value_RESET (for FB SNMP_SET only) Value_Len (for FB SNMP_SET only) V1.0, Entry ID:

18 4 Functional Mechanisms of this Application Value_Type (for FB SNMP_SET only), are assigned as constants in FB Switch_IO. Figure V1.0, Entry ID:

19 4 Functional Mechanisms of this Application Call example: FB SWITCH_IO in FB CALL_SWITCH_IO (FB93) The FB SWITCH_IO function block is called in FB CALL_SWITCH_IO (FB93) and then internally calls the SNMP_GET and SNMP_SET function blocks. The FB CALL_SWITCH_IO (FB93) is called cyclically in OB1. The figure below shows the call of FB SWITCH_IO in FB CALL_SWITCH_IO (FB93). Figure 4-7 Call of FB SWITCH_IO (FB102) V1.0, Entry ID:

20 4 Functional Mechanisms of this Application 4.2 Scenario: Switching the digital output Via the ON_dig_OUT or OFF_dig_OUT input parameters, the FB SWITCH_IO function block (FB102) sends a write job to the IWLAN_Client and switches the digital output of the device on or off Diagram for the Switching the digital output scenario Figure 4-8 The diagrammatic representation below shows how FB SWITCH_IO sends a write job to the device. Manager S7 CPU ON_dig_OUT 1 OFF_dig_OUT FB SWITCH_IO Parameterization of variables Community name: private Local port: B#16#7D0 OID: Value_Len: B#16#1 Value_Type: B#16#2 (INT) Value : B#16#2 (Level-High) 2 IWLAN client READ_dig_OUT INPUT_PARAM DB SWITCH_SET_GET IP_address CALL FB SNMP_SET UDP connection Packet generation Send packet Receive packet 3 Status_ Dig_OUT GETResponse SETRequest 4 MIB DEVICE_ID CON_ID Table 4-2 No. Description 1 ON_dig_OUT or OFF_dig_OUT is triggered. 2 The variables necessary for generating the SETRequest packet are parameterized: IP_ADR DEVICE_ID DB SWITCH_SET_GET CON_ID Community name: Private IDB_SWITCH_IO Local_Port: 2000 OID for the digital output of the SCALANCE W RJ45: snmspsdigitaloutputlevel Constants Value_Type: Integer Value_Len:1 byte Value_SET: Level High (2) or Value_RESET: Level Low (1). 20 V1.0, Entry ID:

21 4 Functional Mechanisms of this Application No. Description 3 The SNMP packet is generated with the call of FB SNMP_SET and sent to the IWLAN client. 4 The IWLAN client responds with a GetResponse message. This message that contains the control variable is evaluated. The control variable is compared to the setpoint. If the two values match, the STATUS_dig_OUT variable will be set or reset Program details for the Switching/switching off the digital output scenario In this section, we show you the most important code fragments of this function from the documented source code of this example. Variables for the SETRequest packet generation Figure 4-9 Parameterization of variables code fragment The following code lines show how the variables for generating the SETRequest packet are parameterized in SCL. Figure 4-10 V1.0, Entry ID:

22 4 Functional Mechanisms of this Application Call of FB SNMP_SET To generate and send the SETRequest packet, the FB SWITCH_IO function block calls the FB SNMP_SET library block. The figure below shows the call of the FB SNMP_SET function block. Figure V1.0, Entry ID:

23 4 Functional Mechanisms of this Application 4.3 Scenario: Checking the status of the digital output By means of the READ_dig_OUT input parameter, the FB SWITCH_IO function block (FB102) sends a read job to the network component and checks the status of the digital output of the device Diagram for the Checking the status of the digital output scenario Figure 4-12 The diagrammatic representation below shows how FB SWITCH_IO (FB102) sends a read job to the device. Manager S7 CPU ON_dig_OUT OFF_dig_OUT FB SWITCH_IO Parameterization of variables Community name: public Local port: B#16#7D0 OID: IWLAN client READ_dig_OUT 1 INPUT_PARAM CALL FB SNMP_GET UDP connection Packet generation Send packet Receive packet 3 Status_ Dig_OUT GETResponse GETRequest 4 MIB DB SWITCH_SET_GET IP_address DEVICE_ID CON_ID Table 4-3 No. 1 READ_dig_OUT is triggered. Description 2 The variables necessary for generating the GETRequest packet are parameterized: IP_ADR DEVICE_ID DB SWITCH_SET_GET CON_ID Community Name: Private IDB_SWITCH_IO Local_Port: 2000 OID for the digital output of the SCALANCE W RJ45: snmspsdigitaloutputlevel Constant V1.0, Entry ID:

24 4 Functional Mechanisms of this Application No. Description 3 The SNMP packet is generated with the call of FB SNMP_GET and sent to the IWLAN client. 4 The network component responds with a GetResponse message. This message that contains the requested variable is evaluated. If the received variable has the value 2, the STATUS_dig_out output parameter will be set 1, the STATUS_dig_out output parameter will be reset. 24 V1.0, Entry ID:

25 4 Functional Mechanisms of this Application Program details for the Checking the status of the digital output scenario In this section, we show you the most important code fragments of this function from the documented source code of this example. Variables for the GETRequest packet generation Figure 4-13 Parameterization of variables code fragment The following code lines illustrate how the variables for generating the GETRequest packet are parameterized in SCL. Figure 4-14 Call of FB SNMP_GET To generate and send the GETRequest packet, the FB SWITCH_IO function block calls the FB SNMP_GET library block. The figure below shows the call of the FB SNMP_GET function block. Figure 4-15 V1.0, Entry ID:

26 4 Functional Mechanisms of this Application 4.4 Error and status display For error diagnostics, the FB SWITCH_IO function block has a STATUS output. By reading the STATUS output of the function block, you are provided with information on logical errors and error messages that may occur during the communication between the controller and the SCALANCE W700. Table 4-4 Status Meaning Support/remark 16# A ON_dig_OUT and OFF_dig_OUT are active simultaneously. Reset these parameters Restart the operation Errors with the 16#01xyyyyy status are errors that occur when the digital output is switched on. Errors with the 16#10xyyyyy status are errors that occur when the digital output is switched off. Errors with the 16#11xyyyyy status are errors that occur when the digital output is read. For information on errors with a different status, please refer to the library description: _Library_SNMP_S7_CPU_DOKU_V1_0_en.pdf (see \1\). 26 V1.0, Entry ID:

27 5 Installation 5 Installation 5.1 Hardware configuration of the S7 station Figure 5-1 The figure below shows the hardware configuration of the application. SCALANCE W748-1 RJ45 2x ANT795-6MT PS307 5A CPU PN/DP 230V PG PROFINET 24V 24V Table 5-1 No. Action Comment 1. Attach the individual modules to a suitable rack. Table 2-1 Hardware components 2. Connect the PS307 to the network. (230 V AC) 3. Connect the following devices: Profinet interface of the engineering PG to the Profinet interface of the CPU Profinet interface of the SCALANCE W748-1 RJ45 to the second Profinet interface of the CPU Ensure that the polarity is correct. NOTICE Before you switch on the power supply, complete and check the configuration! Note Always follow the installation guidelines for the installation of all components. V1.0, Entry ID:

28 5 Installation 5.2 Hardware configuration of the SCALANCE W748-1 RJ45 Table 5-2 No. Action Comment 1 Connect the antennas to the respective sockets. You have to configure the antennas in the WBM of the device (see \6\). 2 Connect the SCALANCE W748-1 to a 24 V direct current source. You can also use the PS307 of the S7 station. NOTICE Before you switch on the power supply, complete and check the configuration! Note Always follow the installation guidelines for the installation of all components. The following table provides an overview of the IP addresses used in this sample program. Table 5-3 Module CPU 315-2PN/ DP PC/ PG SCALANCE W748-1 RJ Installing the software Table 5-4 IP address The engineering station is used as a configuration computer for the S7 station. No. Action Comment 1 Install STEP 7 V5.5. Follow the instructions of the installation program. 2 Install S7-SCL V5.3+SP5. Follow the instructions of the installation program. 28 V1.0, Entry ID:

29 6 Commissioning of the Application 6 Commissioning of the Application 6.1 Installing the application software Table 6-1 The following table lists the steps necessary to install the sample code. No. Procedure Step 1 The project is available on the HTML page from which you downloaded this document. Save the _SCAL_W_IO_SNMP_S7_CPU_CODE_V1_0.zip project to your hard drive. 2 Open the SIMATIC MANAGER and retrieve the STEP 7 project. File > Retrieve 3 The project is now available in User projects. 6.2 Setting the PG/PC interface Table 6-2 No. Action Remark/note 1 In the SIMATIC MANAGER, set the PC interface to TCP/IP Options > Set PC/PG Interface. 2 Select the access path. For the used network card, select TCP/IP. Confirm with OK. V1.0, Entry ID:

30 6 Commissioning of the Application 6.3 Configuring the PC/PG Changing the IP address Table 6-3 The figure shows the network setting to which you have to change the PG/PC! No. Action Remark/note 1 Open the Internet Protocol (TCP/IP) Properties by selecting Start > Settings > Network Connection >Local Connections. Select Use following IP-address and fill out the field as shown in the screen shot. Close the dialog boxes with OK. 2 If your PG has an IWLAN interface, disable it. 30 V1.0, Entry ID:

31 6 Commissioning of the Application 6.4 Configuring the S7 station Changing the IP address of the CPU Before the STEP 7 project can be downloaded to the CPU, you have to change the IP address of the S7 CPU as shown in Table 5-3 via which the project is downloaded to the CPU. Table 6-4 No. Action Note 1 In the SIMATIC Manager, open a STEP 7 project. 2 In the PLC menu, select the Edit Ethernet Node option. 3 Click on the Browse button. V1.0, Entry ID:

32 6 Commissioning of the Application No. Action Note 4 Select the desired module and click on OK to confirm the selection. 5 In the Set IP configurations window that appears, enter the IP address as shown in Table 5-3. Click on the Assign IP Configuration button. Close the dialog box with the Close button. 32 V1.0, Entry ID:

33 6 Commissioning of the Application 6.5 Configuring the SCALANCE W748-1 RJ45 For this application, the SCALANCE W748-1 is commissioned in two steps: Changing the IP address of the device Enabling SNMP access Note For general information on the configuration of the device, please refer to the configuration manual of the SCALANCE W700 devices. The aim of this manual is to enable you to correctly install, commission and operate the devices (see \4\). Changing the IP address To change the IP address of the SCALANCE W748-1 RJ45, you have to follow the steps listed in Fehler! Verweisquelle konnte nicht gefunden werden.. In step 5 of this table, enter the following IP address: Enabling SNMP access Table 6-5 No. Action 1 Connect the PC to the Ethernet socket of the SCALANCE W748-1 RJ45. 2 Start a browser and enter the following address: SCALANCE W RJ45]. In this case, the IP address of the device is Enter user name and password. When logging in for the first time, you will be prompted to change the password for the admin user (see \4\). V1.0, Entry ID:

34 6 Commissioning of the Application No. Action 4 In the System menu, select the configuration overview and enable SNMP. Apply the settings with Set Values. 5 Go to System > SNMP and enter the community names for read and write access. Apply the settings with Set Values. 6.6 Downloading the STEP 7 project Table 6-6 No. Action Comment 1 Open in the SIMATIC MANAGER the STEP 7 Project SNMP_SCAL_W. 34 V1.0, Entry ID:

35 6 Commissioning of the Application No. Action Comment 2 Select the SWITCH_SCALANCE S7 station and download the entire project to your CPU. PLC > Download Note If you compile all blocks newly, set the newly compiled instance data block IDB_SWITCH_IO to non-retain to overwrite the respective instance DB with the initial values when restarting the CPU. V1.0, Entry ID:

36 7 Operation of the Application 7 Operation of the Application 7.1 Overview This chapter shows you how to operate the described scenarios of this application. All necessary variables can be found in the VAT_SNMP variable table. Figure Controlling the digital output Switching the digital output on Table 7-1 Switch-on of the digital output is controlled via the DB93.DBX6.0 IDB_FB93.REQ_SET. Switch on the digital output Switch off the digital output Read out the digital output Error status When the user program detects a positive edge in FB SWITCH_IO, the generation and sending of the SETRequest packet will be triggered. The table below lists instructions for switching the digital output on. No. Action 1 Open DB SWITCH_SET_GET and check if all parameters necessary for generating the SETRequest packet have been entered. View > Data View > Actual Value Save and once again download the DB SWITCH_SET_GET data block. 36 V1.0, Entry ID:

37 7 Operation of the Application No. 2 Open OB1 and update the instances. File > Check and Update Accesses. Action Save and once again download OB1 and the instances. 3 Open the VAT_SNMP variable table. To send the packet, first check if the IDB_FB93.REQ_SET, IDB_FB93.REQ_RESET and IDB_FB93.REQ_READ variables are FALSE. 4 Enable IDB_FB93.REQ_SET. 5 Once the packet is sent (without errors), the Status_dig_OUT variable will be set. 6 Reset IDB_FB93.REQ_SET Switching the digital output off Switch-off of the digital output is controlled via the DB93.DBX6.1 IDB_FB93. REQ_RESET. When the user program detects a positive edge in FB SWITCH_IO, the generation and sending of the RESETRequest packet will be triggered. The table below lists instructions for switching the digital output off. V1.0, Entry ID:

38 7 Operation of the Application Table 7-2 No. 1 Follow steps 1-3 of Table Enable IDB_FB93.REQ_RESET. Action 3 Once the packet is sent (without errors), the Status_dig_OUT variable will be reset. 4 Reset IDB_FB93.REQ_RESET. 7.3 Checking the status of the digital output Table 7-3 No. The check of the status of the digital output is controlled via the DB93.DBX6.2 IDB_FB93.REQ_READ. When the user program detects a positive edge in FB SWITCH_IO, the generation and sending of the GETRequest packet will be triggered. The table below lists instructions for checking the status of the digital output. Action 1 Open DB SWITCH_SET_GET and check if all parameters necessary for generating the GETRequest packet have been entered. View > Data View > Actual Value Save and once again download the DB SWITCH_SET_GET data block. 2 Follow steps 2-3 of Table V1.0, Entry ID:

39 7 Operation of the Application No. 3 Enable IDB_FB93.REQ_READ. Action 4 Once the packet is sent (without errors), the Status_dig_OUT variable will be set or reset. 5 Reset IDB_FB93.REQ_READ. Note If you want to check the status of the digital input of the SCALACE W748-1 RJ45, use the FB SNMP_GET library block. For information on this block, please refer to the _Library_SNMP_S7_CPU_DOKU_V1_0_en.pdf library description (see \1\). The OID object for the digital input of the SCALACE W748-1 RJ45 is V1.0, Entry ID:

40 8 Glossary 8 Glossary MIB OID SNMP The Management Information Base (MIB) describes the information that can be polled or modified via a network management protocol (for example, SNMP). This information is called managed objects. In computer science, an object identifier (OID) is a globally unique identifier used to name an information object. An OID represents a node in a hierarchically-assigned namespace that is defined by the ASN.1 standard. Each node is uniquely identified by successive numbers that, starting at the root of the tree, indicate its position. SNMP means Simple Network Management Protocol. This protocol allows network administrators to manage network issues and analyze network problems. UDT The User Datagram Protocol (UDP) is a minimal, connectionless network protocol that belongs to the transport layer of the Internet protocol family. The task of UDP is to transfer data that is transmitted over the Internet to the right application. 40 V1.0, Entry ID:

41 9 References 9 References 9.1 References This list is by no means complete and only presents a selection of related references. Table 9-1 Topic Title /1/ STEP7 Automating with STEP7 in STL and SCL Hans Berger Publicis Corporate Publishing ISBN Internet links This list is by no means complete and only provides a selection of useful information. Table 9-2 Topic \1\ Reference to the document \2\ Siemens Industry Online Support \3\ Overview of communication services supported by PN-CPUs \4\ SCALANCE W700 Web Based Management Configuration Manual \5\ SIMATIC PROFINET System Description Title History Table 10-1 Version Date Modification V1.0 04/12 First edition V1.0, Entry ID: