5/30/2011 7:27 AM | |
Posts: 4 Rating: (0) |
Hi All, I am trying to establish communication between Siemens S7200 (Model:224 Release:2.01) PLC and Deif MTR-2 power transducer over RS485 RTU. I am trying to read 32 bit floating point metering (Voltage, Current, KW, etc.) data from the transducer. However I keep getting time out errors. So far I have tried the following: 1) Checked continuity of the network cable 2) Swapped polarity of the wires 3) Increased response time out period for the MBUS_MSG instruction 4) Checked baud rate, parity, node address 5) Replaced the transducer with a spare one 6) MBUS_MSG instruction is triggered on a positive edge 7) Checked that the DB9 connector on the PLC is functioning properly 8) Checked if the LCOM DB9 to Terminal block connector is working properly (by connecting RS485 converter on pins 3 and 8 of the connector while the connector was still connected to the RS485 network and disconnected from the PLC, and read data from the transducer using Modscan32) In spite of above testing, I am still getting the time out error. I have attached my program with this post. I would really appreciate if someone could take a look at the program and let me know if there is an error(s) in the program or otherwise have more ideas on troubleshooting this problem. Thanks in advance. Amit
AttachmentS7-200 Modbus Program.pdf (85 Downloads) |
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