1 lldeckblatt Data Communication between S7 Station and PC Station, using the SIMATIC NET OPC Server Explanation of the Functionality of the S7 Block Service, from the View of a SIMATIC User SIMATIC S7 Functional 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 ( The following link takes you directly to 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. 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 the document 1.2 Content and validity of the document Content The following service is examined in the document: S7 block service The service is used with the following boundary conditions: OPC server type: COM (Data Access) Communication function: S7 communication Network: PROFINET / Industrial Ethernet In the theoretical part (chapter 2 and chapter 3) the basics are explained, in the practical part (chapter 4) the basics are concretely applied on a simple test set up. Validity The statements in the document are valid for: SIMATIC NET, PC Software V8.2 STEP 7 V11 6 V1.0, Entry ID: 7 2 Properties of the Service 2 Properties of the Service 2.1 Properties Application, properties and function model of the S7 block service are described in the chapter. 2.1 Properties Communication blocks (/5/) are used in the SIMATIC S7 CPUs to transfer large amounts of data (data blocks). Examples for communication blocks in S7 CPUs: BSEND / BRCV USEND / URCV The SIMATIC NET OPC server in the PC station can be the communication partner for BSEND or BRCV communication blocks of the S7 CPU. For this purpose the S7 block services are used in the OPC server. Communication is possible in both directions: Data from S7 station to PC station Data from PC station to S7 station The block services of the SIMATIC NET OPC server are suitable for the transmission of large volumes of data (max. Note: S7 block services are not available for all S7 CPUs. Nfsu 2 camera model. V1.0, Entry ID. 8 2 Properties of the Service 2.2 Functional model 2.2 Functional model Overview With the help of the S7 block services, data between a PC station and a S7 station can be exchanged.
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