No Communications between Panel and PLC
The C-more Micro-Graphic panel communicates with a designated PLC or controlling device
through the panel’s RS-232 / RS-485 / RS-422 communications port (Port2).
1. Check the Txd and Rxd status indicators of Port2. The indicator LED’s should be on or
flashing at a fast rate. If there is activity on the LED indicators, then the panel and PLC are
communicating.
NOTE: For communications to be present between the panel and PLC, the panel must contain a project
requesting data from the PLC.
If there is no activity on one or both TxD and RxD LED status indicators, then it should be
suspected that either:
1. The communication settings are incorrect - Open Panel Manager in the C-more Micro-Graphic
programming software and verify that the correct panel Comm. Port is selected. Verify that the
correct PLC protocol is selected and properly configured.
2. The cable is bad and needs to be replaced - Try a proven cable.
3. Test panel serial port. See Chapter 5, Serial Port - Loop Back Test. If possible switch the panel with
a panel that is communicating properly.
4. The serial port on the PLC is defective. If possible switch the panel with a panel that is
communicating properly. Call the AutomationDirect returns department at (800) 633-0405
NOTE: Electrical noise, pulse generating wiring and/or improper grounding can also cause problems with
communications. Refer to the Electrical Noise Problems section in this chapter for additional help if
electrical noise is suspected. Selecting a lower communication rate in Panel Manager may help the panel
resist noise.
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