Having a hard time with this one:
The attachment has the controller and message error details.
The controller is sending a message to an ancient DOS PC. The PC has a specialty board that has a read and write output hardwired to 2 PLC inputs. I can see both of these bits toggling at the correct times. The PLC uses read and write message instructions over channel 0 that is configured as per the attachment. The PC receives the data when it is sent, but when the PLC tries to read the data from the PC nothing is returned. Either read or write message returns the error "you used the wrong station number", yet the PC receives the data. The channel status for channel 0 always shows that msg sent and received are the same, with no errors, unless I unplug the channel. Any suggestions?
The attachment has the controller and message error details.
The controller is sending a message to an ancient DOS PC. The PC has a specialty board that has a read and write output hardwired to 2 PLC inputs. I can see both of these bits toggling at the correct times. The PLC uses read and write message instructions over channel 0 that is configured as per the attachment. The PC receives the data when it is sent, but when the PLC tries to read the data from the PC nothing is returned. Either read or write message returns the error "you used the wrong station number", yet the PC receives the data. The channel status for channel 0 always shows that msg sent and received are the same, with no errors, unless I unplug the channel. Any suggestions?