I’m running a 8212 with a 750-652 module trying to talk to some modbus slaves. The communication HAS worked, but now it does’nt. I get the following errors from the FbMbMasterSerial function block:
153 ‘Error time out’
154 ‘Error while transmission → transportlayer can not transmit’
I have terminating resistor in both ends of the line.
When the communication was working, some LEDs where flashing on the module. Now LEDs A and E has steady light.
Any ideas on what could be wrong?