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I have ET 200SP configuration and I need to configure MODBUS configuration with non Siemens product. I use CM PtP communication module and it is configured for MODBUS communication RS 485 two wire operation. When I try to configurate the MODBUS with Modbus_Comm_Load block, I have always status 7000 (Block idle) and I can not establish communication. Also, the both Tx and Rx LED on the module don't FLASHES. Both are off all the time. The DIAG LED is on. Can anybody help me to solve this problem.
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