How to set up communication between CP343-1 and Zhejiang University’s ECS700
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This post was last edited by zhanght321 on 2018-5-3 15:20. Question for experts: How do I set up TCP/IP communication between Siemens CP343-1 and Zhejiang University’s ECS700? Thank you! ! !
The essence should be MODBUS TCP communication
I asked Siemens whether MODBUS TCP/IP is different from TCP/IP
It is different. The Ethernet communication module COM742-S is an Ethernet heterogeneous device access module for the ECS-700 system. By expanding the I/O bus, it enables the integration of data from third-party devices that use the same communication protocol (MODBUS/TCP protocol) into the ECS-700 system. This module can be configured in a redundant manner to ensure higher reliability. You have the COM742 module on site, right?
Thank you, budaoweng123. What I would like to ask is whether the COM742-S can communicate with the Siemens CP343-1 over TCP/IP
Well, it’s impossible to establish communication simply through TCP/IP; MODBUS/TCP is required. Modbus TCP is a communication protocol based on TCP/IP; this means that both parties need to have IP addresses assigned to them, usually within the same network segment, and it uses port 502. Then the communication messages are still in Modbus format, meaning that each communication point corresponds to a Modbus communication address. The software option package \"ModbusTCP CP\" with order number 2XV9450-1MB00 is required when the S7 controller establishes a Modbus/TCP connection with third-party devices via external CP343-1 or CP443-1; it provides single licensing (valid for only one CPU)
Thank you to budaoweng123 for the detailed explanation :)