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Tuesday, 24 March 2009 16:22

Via Com-Server onto S7-PPI network

Written by JHB
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Up- and downloading of controller programs as well as status monitoring are handled with the Siemens S7-200 using the PPI interface. Connection to the PC used as a programming device is frequently implemented using the RS232/PPI Multi-Master cable.

To extend this connection to a physically remote computer or to access from different work stations, a special serial cable with line drivers and if necessary a manual switcher generally needs to be installed. Alternative use of an Ethernet CP would necessitate modifying the S7 project/programm file. In addition, each individual PLC would needs its own CP.

Use of a Com-Server on the other hand provides a simple solution that works without any modifications to the controller program and usually eliminates any cabling expense. The RS232/PPI Multi-Master Cable is coinnected to the Com-Server instead of the PC. You install the COM Port Redirector on the PC and then simply tell Step7/Microwin on which virtual COM port it should look for the controller components - that's it.

The serial data are tunneled to the Com-Server and the controllers connected to it via TCP/IP or even over the Internet if needed. The three essential steps are as follows:


The Com-Server is connected to the RS232/PPI Multi-Master Cable and the network.

The COM Port Redirector is used to create a virtual COM port on the STEP7 PCs, …

Read 2296 times Last modified on Friday, 09 February 2018 18:23

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