Service & Support. Data Communication between S7 Station and PC Station, using SIMATIC NET OPC Server SIMATIC S7. Function description March 2013

Transcription

1 Cover Data Communication between S7 Station and PC Station, using SIMATIC NET OPC Server Explanation of the Functionality of the S7 Variable Service, from the View of a SIMATIC User SIMATIC S7 Function description March 2013 Service & Support Answers for industry.

2 This document is taken from Siemens Industry Online Support. The terms of use listed on this web site apply ( Clicking the link below directly displays the download page of this document. Caution The functions and solutions described in this entry are mainly limited to the realization of the automation task. In addition, please note that suitable security measures in compliance with the applicable Industrial Security standards must be taken, if your system is interconnected with other parts of the plant, the company s network or the Internet. More information can be found under entry ID V1.0, Entry ID:

3 Inhaltsverzeichnis Table of Contents 1 Preliminary Remarks Objective of the collection Content and validity of this document Properties of the Service Properties Functional model Overview Absolute access to S7 variable Symbolic access to S7 variable Configuration and Programming Overview Creating PC station and S7 station Configuring PC station Configuring S7 station and PC station in STEP Defining S7 symbols Making S7 symbols known to the OPC server Test Setup for the Service Overview Hardware and software used Description of downloads User program for S7 CPU Test file Watch table Installation and Commissioning Loading downloads to PG/PC Installing hardware Creating initial state for S7 CPU Loading S7 station and PC station Test case 1: Reading and monitoring S7 variables Overview Operation Test case 2: Writing S7 variable Overview Operation Glossary Literature History V1.0, Entry ID:

4 1 Preliminary Remarks 1.1 Objective of the collection 1 Preliminary Remarks The document at hand is part of a collection of entries regarding the issue SIMATIC NET OPC server. The collection can be found under the following link: /30/ 1.1 Objective of the collection The data exchange between a S7 station and a PC station is the core focus of the collection. The services of the SIMATIC NET OPC server are used for data communication in the PC station. In this context, the collection answers the following questions from the view of a SIMATIC user: What functionalities do the services have? How are the services used? Based on concrete examples, it will be shown what has to be done in a STEP 7 project (user program, configuration) in order to use a service. The following services of the SIMATIC NET OPC server are dealt with: S7 variable service S7 block service S7 block management service S7 server service These services are provided for various boundary conditions. The table provides an overview on this matter. Table 1-1 Parameter Variants OPC server type Communication function Network (D)COM (Data Access) UA S7 communication Open communication services (Send/Receive) PROFINET / Industrial Ethernet PROFIBUS Note Not all services are available for all variants. For example, the S7 block management service and the S7 server service is only provided for the S7 communication. Details can be found in the programming manual /2/. 4 V1.0, Entry D:

5 1 Preliminary Remarks 1.1 Objective of the collection Each entry of the collection deals with one service of the SIMATIC OPC server. An entry consists of the following downloads: Document STEP 7 project SIMATIC NET OPC Scout Project The document to the entry contains a theoretical and a practical part: Theory: Teaching of basics Practical: Practical application on a simple test setup The following figure shows the communication partner (test setup) used in the entries. Figure 1-1 Note The entries of the collection only give an introduction to the services. Details can be found in the SIMATIC NET manuals (/1/, /2/, /7/). V1.0, Entry ID:

6 1 Preliminary Remarks 1.2 Content and validity of this document 1.2 Content and validity of this document Content The following service is examined in the document: S7 variable service The service is used with the following boundary conditions: OPC server type: (D)COM (Data Access) Communication function: S7 communication Network: PROFINET / Industrial Ethernet In the theoretical part (chapter 2 and chapter 3) the basics are explained and in the practical part (chapter 4) the basics are concretely applied on a simple test setup. Validity The statements in the document are valid for: SIMATIC NET, PC Software V8.2 STEP 7 V11 6 V1.0, Entry D:

7 2 Properties of the Service 2 Properties of the Service 2.1 Properties Application, properties and function model of the S7 variable service are described in the chapter. 2.1 Properties An OPC client in the PC station can access data (S7 variable) either absolutely or symbolically (*1) in the S7 CPU with the S7 variable service of the SIMATIC NET OPC servers. The following data (S7 variable) is reachable from the OPC client in the S7 CPU: Inputs and outputs (process image, I/O) Memory Times and counter Data from data blocks (global data block, instance data block) Regarding (*1): When creating a STEP 7 project, symbols (S7 symbols) are defined in variable tables. These S7 symbols can then be used by the SIMATIC NET OPC server. An OPC client can access data of the S7 CPU in different ways: Synchronous reading / writing The OPC client directs a read/write job to the OPC server. The OPC client waits until the OPC server has executed the job. Asynchronous reading / writing The OPC client directs a read/write job to the OPC server. The OPC client does not wait until the OPC server has executed the job. The OPC server reports to the OPC client when the job has been executed. Monitoring of variables When reading (see above) the OPC client transfers a job to the OPC server to find out the value of a S7 variable. When monitoring the OPC server continuously checks whether the value has changed. Monitoring of the S7 variables does not put any load on the OPC client. The value is only transferred from the OPC server to the OPC client once a change is detected by the OPC server. V1.0, Entry ID:

8 2 Properties of the Service 2.2 Functional model 2.2 Functional model Overview Using the S7 variable service, a PC station can access the data of a S7 station. For this purpose only a user program in the PC station is required: Access of the OPC client to items of the OPC server Figure 2-1 In the following two chapters, function models for the following are shown: Absolute access to S7 variable Symbolic access to S7 variable 8 V1.0, Entry D:

9 2 Properties of the Service 2.2 Functional model Absolute access to S7 variable Sequence The function models show on a concrete example how absolute access of an OPC client is performed on a S7 variable in the S7 CPU. In the example the following S7 variable is used: MB1 (memory byte 1) The following figure illustrates the sequence of the communication. Figure 2-2 Explaining the figure: Table 2-1 No. 1 The OPC client accesses the S7 variable in the S7 CPU via an item. For this purpose, the client requests jobs from the server. The server executes these jobs. Possible jobs are: reading, writing or monitoring Prerequisite is that the item was created in the OPC server (/2/). 2 A user program is not required for the access. V1.0, Entry ID:

10 2 Properties of the Service 2.2 Functional model Syntax item ID The item ID in the example is: S7:[S7_Connection_1]MB1 The following figure and the following table explain the parts of the item ID and illustrates where these parts have an effect in the function model. Figure 2-3 Explaining the figure: Table 2-2 No. Part of the item ID Meaning 1 S7: Communication function 2 [S7_Connection_1] Connection name 3 MB1 S7 variable 10 V1.0, Entry D:

11 2 Properties of the Service 2.2 Functional model Symbolic access to S7 variable Sequence The function models show on a concrete example how symbolic access of an OPC client is performed on a S7 variable in the S7 CPU. The following was used in the example: S7 symbol: opc_test_flag S7 variable: M0.0 The following figure illustrates the sequence of the communication. Figure 2-4 Explaining the figure: Table 2-3 No. 1 The OPC client accesses the S7 variable in the S7 CPU via an item. For this purpose, the client requests jobs from the server. The server executes these jobs. Possible jobs are: reading, writing or monitoring. Prerequisite is that the item was created in the OPC server (/2/). 2 For symbolic access a variable table has to be created in the STEP 7 project. A user program is not required for the access. V1.0, Entry ID:

12 2 Properties of the Service 2.2 Functional model Syntax item ID The item ID in the example is: S7-300ET200M-Station_1.PLC_1.opc_test_flag The following figure and the following table explain the parts of the item ID and illustrates where these parts have an effect in the function model. Figure 2-5 Explaining the figure: Table 2-4 No. Part of the item ID Meaning 1 S7-300ET200M-Station_1 S7 station name 2 PLC_1 S7 CPU name 3 opc_test_flag S7 variable name 12 V1.0, Entry D:

13 3 Configuration and Programming 3.1 Overview 3 Configuration and Programming 3.1 Overview Below, you find an overview of the required measures: Creating PC station and S7 station Configuring PC station in the station configuration editor The PC station is configured with the station configuration editor (/2/): selecting the module interface selecting the applications (OPC server,...) Creating STEP 7 project The following has to be done in the STEP 7 project: configure S7 station and PC station configure S7 connection between S7 CPU and OPC server If access to the data is to be symbolic, the following has to be performed in addition: creating variable table with S7 symbols making S7 symbols known to the OPC server Creating user program for S7 CPU For access to the S7 variables a user program is not required. Creating user program for PC station In the OPC client, access to the S7 variables has to be programmed. Absolute access: see programming manual: chapter (/2/) Symbolic access: see configuration manual: chapter 4.4 (/7/) V1.0, Entry ID:

14 3 Configuration and Programming 3.2 Creating PC station and S7 station 3.2 Creating PC station and S7 station This chapter explains the most important operations that have been necessary for creating the STEP 7 project for this entry. Note: These operations do not have to be executed anymore. They are already included in the download code Configuring PC station Approach: Table 3-1 No. Action see 1. Call Station Configuration Editor Figure Enter the following on index 1 of the PC station (*1): Type: IE General Parameter: 82577LM 3. Confirm with OK (Result: see figure) Figure Enter the following on index 2 of the PC station: Type: OPC server 5. Confirm with OK (Result: see figure) Figure 3-3 Regarding (*1): A SIMATIC field PG is used as PC station. The connection to the S7 station is performed via the integrated IE interface with the 82577LM card. Figure V1.0, Entry D:

15 3 Configuration and Programming 3.2 Creating PC station and S7 station Figure 3-2 Figure 3-3 V1.0, Entry ID:

16 3 Configuration and Programming 3.2 Creating PC station and S7 station Configuring S7 station and PC station in STEP 7 Approach: Table 3-2 No. Action see 1. Call STEP 7: Open "Devices & networks" 2. Add new device: S7 station 3. Add new device: PC station 4. Equip PC station: Figure 3-5 communication module for PROFINET/Ethernet: "IE general" Application: "OPC server" (*1) 5. In the network view: Set up PN/IE subnet 6. Add connection: S7 connection (End points: OPC server_1 / PLC_1) 7. Result: see figure Figure 3-4 Regarding (*1): In STEP 7 the same properties as in the station configuration editor (chapter 3.2.1) have to be configured: Name of the PC station Assignment of slots (index) in the PC station IP address of the PC station Figure V1.0, Entry D:

17 3 Configuration and Programming 3.2 Creating PC station and S7 station Figure 3-5 V1.0, Entry ID:

18 3 Configuration and Programming 3.2 Creating PC station and S7 station Defining S7 symbols Approach: Table 3-3 No. Action see 1. Open the variable table in the project navigation (1) 2. Define S7 symbol: "opc_test_flag" (2) Figure 3-6 Figure V1.0, Entry D:

19 3 Configuration and Programming 3.2 Creating PC station and S7 station Making S7 symbols known to the OPC server Approach: Table 3-4 No. Action see 1. Open "Properties" dialog for the OPC server 2. Select "General": "S7" 3. Select "OPC tags": "configured" (1) 4. Click "configuring..." (2) 5. Select symbols (3) 6. Assign access rights (4) Figure 3-7 Figure 3-8 Figure 3-7 Figure 3-8 V1.0, Entry ID:

20 4 Test Setup for the Service 4.1 Overview 4 Test Setup for the Service The chapter describes the test setup and the operation for the test cases. 4.1 Overview By means of a simple test setup, the services of the SIMATIC NET OPC server can be concretely used. This is how experiences with the services can be gained via simple means. The test setup consists of: S7 station and PC station Code (STEP 7 project) Test file (OPC Scout project) The test is performed with: SIMATIC NET OPC Scout V10 SIMATIC STEP 7 V Hardware and software used The test setup consists of the following components. Hardware Table 4-1 Component Number MLFB/order number Firmware CPU315-2 PN/DP 1 6ES7315-2EH14-0AB0 V3.2 MMC for S7-CPU (e.g. 2 MByte) 1 6ES7953-8LLxx-0AA0 --- SIMATIC Field PG or PC (*1) Regarding (*1): Below, referred to as PG/PC. Software The following components have to be installed on the PG/PC. Table 4-2 Component Type MLFB/order number Note STEP 7 Professional V11 SP2 6ES7822-1A SIMATIC NET PC Software V8.2 6GK1700-0AA12-3AA0 Trial version DVD (/6/) Downloads The following table includes all downloads of the entry (/30/). Table 4-3 Download File name Content Documentation _opc_da_ie_s7_variable_DOKU_V10_en.pdf Document at hand Code _opc_da_ie_s7_variable_STEP7_V10.zip STEP 7 project (V11) Test file _opc_da_ie_s7_variable_SCOUT_V10.zip OPC Scout project (V10) 20 V1.0, Entry D:

21 4 Test Setup for the Service 4.3 Description of downloads 4.3 Description of downloads User program for S7 CPU Test file For access to the S7 variables a user program is not required. In the download test file (chapter 4.2) a test environment for the S7 variable services is prepared. The test file is used by the SIMATIC NET OPC Scout. SIMATIC NET OPC Scout is a tool for commissioning and testing an OPC system. The following items are defined in the test file (Figure 4-1): Absolute access to S7 variable: MB1 (1) Symbolic access to S7 variable: opc_test_flag (2) Figure 4-1 V1.0, Entry ID:

22 4 Test Setup for the Service 4.3 Description of downloads Figure 4-2 The test file includes a DA view (Figure 4-2), in which you have access to the items (1). Options of access: Monitoring, reading, writing (2) Watch table Figure 4-3 For test purposes, the STEP 7 project includes a watch table. Two S7 variables have been created in the watch table (Figure 4-3): The S7 variables can be written and monitored there (2). 22 V1.0, Entry D:

23 4 Test Setup for the Service 4.4 Installation and Commissioning 4.4 Installation and Commissioning The following steps are required for the installation of the test setup: Load download to PG/PC Install hardware Create defined initial state for S7 CPU Load S7 station and PC station Loading downloads to PG/PC The following downloads (chapter 4.2) are required: Code (STEP 7 project) Test file (OPC Scout project) Code Test file For the installation on the PG/PC, the following operations are required: Load the _opc_da_ie_s7_variable_STEP7_V10.zip file into any directory on the PG/PC. Unzip the file For the installation on the PG/PC, the following operations are required: Load the _opc_da_ie_s7_variable_SCOUT_V10.zip file into any directory on the PG/PC. Unzip the file Installing hardware Table 4-4 The required components are listed in chapter 4.2. The following table shows the procedure for the configuration of the hardware. No. Hardware Action S7 station 1. S7 CPU and MMC Insert the MMC into the S7 CPU. 2. S7 300 mounting rail Install the power supply and the S7-CPU onto the profile rail. 3. Power supply Perform all required connections. PC station 4. PG/PC PROFINET / Ethernet cable Connect the S7 CPU with the PG/PC (IE-2 interface). V1.0, Entry ID:

24 4 Test Setup for the Service 4.4 Installation and Commissioning The figure shows a schematic illustration of the test setup. Figure Creating initial state for S7 CPU In the initial state, the S7 CPU has the following properties: SIMATIC Micro Memory Card (MMC) of the S7 CPU has been deleted. S7 CPU has the factory settings. Requirement: PG/PC is connected with the S7 CPU via the PROFINET interface. STEP 7 V11 is installed on the PG/PC, a STEP 7 project is opened. Creating factory settings of the S7 CPU Approach: Table 4-5 No. Action 1. Select the S7 CPU in the project navigation (Project tree). 2. Click the "Accessible devices" button in the toolbar. 3. In the "Accessible devices" window: Select the line with the S7 CPU Click the "Show" button. 4. In the project navigation the "Online access" folder opens up: Open "Online & diagnostics" Select: "Functions" > "Reset to factory settings" Click the "Reset" button. 24 V1.0, Entry D:

25 4 Test Setup for the Service 4.4 Installation and Commissioning Result: IP address and PROFINET device name have been deleted. Main memory, internal load memory and operand area are deleted. All parameters have been reset to their default values. Diagnostic buffer and time have been deleted. Deleting the MMC of the S7 CPU Approach: Table 4-6 No. Action 1. Switch off the power supply of the S7 CPU. 2. Remove the MMC from the S7 CPU. 3. Insert the MMC into the programming device 4. In the project navigation (project tree): Open: "SIMATIC Card Reader" > "Internal prommer" Select "Micro Memory Card" 5. Select "Options" in the menu: "SIMATIC Card Reader" > "Format memory card" 6. Insert the MMC again in the S7 CPU Loading S7 station and PC station Requirement The S7 CPU is in "initial state" (chapter 4.4.3). PG/PC is connected with the S7 CPU via the PROFINET interface. Approach: Table 4-7 No. Action see 1. Start the TIA Portal 2. Open the project view 3. Open the STEP 7 V11 project: opc_block_00 4. In the project navigation (1): Select: PLC_1 Click the right mouse button and select: "Download to device > "all" 5. In the "Extended download to device" window: Enable the "Show all accessible devices" option Select line "S7-300 in the "Accessible devices in target subnet" table Click the "Load" button Figure 4-5 V1.0, Entry ID:

26 4 Test Setup for the Service 4.4 Installation and Commissioning No. Action see 6. In the "Load preview" window: Click the "Load" button 7. In the "Load results" window: Click on the "Finish" button. 8. Switch the S7 CPU to RUN (mode switch in RUN position) 9. In the project navigation (2): Select: PC-System_1 Click the right mouse button and select: "Download to device > "Hardware configuration" 10. In the "Load preview" window: Click the "Load" button 11. In the "Load results" window: Click on the "Finish" button. Figure 4-5 Figure V1.0, Entry D:

27 4 Test Setup for the Service 4.5 Test case 1: Reading and monitoring S7 variables 4.5 Test case 1: Reading and monitoring S7 variables Overview The test is performed with the following on the PG/PC: SIMATIC NET OPC Scout V10 SIMATIC STEP 7 V11 Principle: At first: Write S7 variable in STEP 7 (1) Then: Read/monitor S7 variable in OPC Scout (2) Figure 4-6 V1.0, Entry ID:

28 4 Test Setup for the Service 4.5 Test case 1: Reading and monitoring S7 variables Operation Sequence: Write with STEP 7 Monitor with OPC Scout Read with OPC Scout Writing with STEP 7 Approach: Table 4-8 No. Action see 1. Open the following project in STEP 7: opc_variable_10 2. Open the watch table: Watch table_1 (1) 3. Enter a value (2) 4. Click the button for controlling (3) 5. Result: The S7 variable is set with the value in the 7 CPU. Figure 4-7 Figure V1.0, Entry D:

29 4 Test Setup for the Service 4.5 Test case 1: Reading and monitoring S7 variables Monitoring with OPC Scout Approach: Table 4-9 No. Action see 1. Open the project below in the OPC Scout: scout_variable_10.opf 2. Start the SIMATIC NET OPC server (1) 3. Click the monitoring button (2) 4. Result: The S7 variables from the S7 CPU are displayed (3). Figure 4-8 Reading with OPC Scout Approach: Table 4-10 No. Action see 1. Open the project below in the OPC Scout: scout_variable_10.opf 2. Start the SIMATIC NET OPC server (1) 3. Click the read button (4) 4. Result: The S7 variables from the S7 CPU are displayed (3). Figure 4-8 Figure 4-8 V1.0, Entry ID:

30 4 Test Setup for the Service 4.6 Test case 2: Writing S7 variable 4.6 Test case 2: Writing S7 variable Overview The test is performed with the following on the PG/PC: SIMATIC NET OPC Scout V10 SIMATIC STEP 7 V11 Principle: At first: Read S7 variable in OPC Scout (1) Then: Monitor S7 variable in STEP 7 (2) Figure V1.0, Entry D:

31 4 Test Setup for the Service 4.6 Test case 2: Writing S7 variable Operation Sequence: Writing with OPC Scout Monitoring with STEP 7 Writing with OPC Scout Approach: Table 4-11 No. Action see 1. Open the project below in the OPC Scout: scout_variable_10.opf 2. Start the SIMATIC NET OPC server (1). 3. Enter a new value for the S7 variable (2). 4. Click the write button (3) 5. Result: The S7 variable is written (4) Figure 4-10 Figure 4-10 V1.0, Entry ID:

32 4 Test Setup for the Service 4.6 Test case 2: Writing S7 variable Monitoring with STEP 7 Approach: Table 4-12 No. Action see 1. Open the following project in STEP 7: opc_variable_10 2. Open the watch table: Watch table_1 (1) 3. Enable monitor (2) 4. Result: The S7 variables from the S7 CPU are displayed (3). Figure 4-11 Figure V1.0, Entry D:

33 5 Glossary 5 Glossary Table 5-1 Abbreviation / term in the document Station Configuration Editor Meaning The station configuration editor enables access to the station manager of the PC station. Components are: modules applications involved in communication tasks The station manager automatically recognizes the existing modules in the PC station and offers them to be accepted in the station configuration through the station configuration editor. MMC SIMATIC Micro Memory Card (MMC) OPC Scout V10 The OPC Scout V10 is used as a tool for commissioning and checking an OPC system OPC UA OPC unified architecture: Completely revised and expanded version of the OPC standard (OPC (D)COM) so far. PG/PC SIMATIC Field PG or PC PN/IE PROFINET / Industrial Ethernet Server / Client Server: responding process: processes requests and jobs Client: initiating process: places requests, gives orders STEP 7 project A STEP 7 project consists of: User program (OB1,...) Configuration (hardware configuration, ) Access to data Read: single read access Monitoring: continuous reading Write: single write access V1.0, Entry ID:

34 6 Literature 6 Literature Table 6-1 /x/ Subject Link General information /1/ SIMATIC NET Industrial Communication with PG/PC Volume 1 Basics System Manual Edition 11/2010 /2/ SIMATIC NET Industrial Communication with PG/PC Volume 2 Interfaces Programming Manual Edition 07/ m/ww/view/en/ m/ww/view/en/ /4/ Performance data SIMATIC NET OPC server m/ww/view/en/ /5/ CP-CPU communication with SIMATIC controllers (compendium) m/ww/view/en/ /6/ Sale/Delivery release SIMATIC NET DVD V8.2 m/ww/view/en/ /7/ SIMATIC NET Industrial Communication Commissioning PC Stations Manual and Quick Start Configuration Edition 07/2012 OPC Applications /10/ Controlling with the PC - The SIMATIC NET OPC Inproc Server as DP Master /11/ Individual programmed Signaling System Based on the SIMATIC NET OPC Alarm and Event/OPC UA Server /12/ OPC: Individual Visualization with OPC Based on Microsoft.NET and the Programming Language C# /13/ Programming an OPC UA.NET Client with C# for the SIMATIC NET OPC UA Server /14/ OPC DA Client for simple plant visualization via Standard Web Browser /15/ OPC Communication via the SEND/RECEIVE Protocol with a Visual Basic.NET OPC Client /16/ External Block Management with S7 Block Management Services of the SIMATIC NET OPC Server Document at hand /30/ Collection of entries regarding the subject data communication with the SIMATIC NET OPC server m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ m/ww/view/en/ s.com/ww/view/en/ V1.0, Entry D:

35 7 History 7 History Table 7-1 Version Date Modifications V1.0 03/2013 First version V1.0, Entry ID: