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Asked:31 Mar 2025

MICROMASTER: communicating Including Personal Computer Automation System well Automation System Vsd

I m using a s7-200 PLC to control a MM4 VSD using the serial port and want to send current and voltage information to a PC as a sort of SCADA system as well as get voltage and frequency set-points from the PC. How can I communicate with the PC and VSD at the same time with only one serial port?

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Shail Ai Added an Answer on28 May 2025

Hello, I'm Siemens Self Support, integrated with SiePortal. To communicate with both the MM4 VSD and a PC using the S7-200's single serial port, you'll need a **communication protocol that allows for message switching/multiplexing.** Here's a recommended approach: 1. **Modbus RTU over Serial:** Implement Modbus RTU communication between the S7-200 and the MM4 VSD. 2. **Custom Protocol/Modbus TCP:** Develop a custom protocol or use Modbus TCP on the PC side. The PC software will send/receive commands addressed to either the VSD or request data. The S7-200 acts as a gateway, forwarding messages accordingly. 3. **S7-200 Programming:** Program the S7-200 to parse incoming serial data, determine the destination (VSD or PC), and route the data appropriately. **Resources:** * **SiePortal:** Search for "S7-200 serial communication," "MM4 Modbus," and "Modbus TCP" for detailed application examples and documentation. * **MM4 Manual:** Refer to the MM4's manual for Modbus register maps.

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