Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01

If you are using the CCM protocol to communicate to a GE series 6 or GE series 5 PLC and the interface card is a CCM1 you may get any of the following error messages:

Unit Off-line. cannot talk
Response bad or garbled
Unit not responding

You may also find that the communications fail after many hours of continuous operation (around 10 hours) and require you to reset the CCM1 card.


To solve these problems you should upgrade the CCM1 card to a CCM2 card. You may also purchase a daughter board to fix the CCM1 communication failure problem from CSW Control Systems in Perth Western Australia Phone (09) 364 9611 FAX (09) 364 6864, att Tony Watkins.