Applies To:
  • CitectSCADA 5.xx, 6.xx

When using the PSDirect driver, I get the following error in CitectSCADA: "Warning device <IODEVICE NAME> missing poll block S0>S199 in backend". The backend of the driver seems to be polling the PLC correctly but I do not get any Comms in Citect.

The COMMS problem can be caused by the following:

1. Incorrect naming of the IO device in CitectSCADA. The name of the IO device should be exactly the same as the Device Name in the driver configurator (or the back end of the driver).

2. The Backend IO device does not exist

3. The Backend IO device config is missing the pollblock S0-S199 which is required for correct UNIT status sensing by the frontend.

If you need multiple Citect IO devices connected to One Backend IO device OR require different naming:

In the Citect IO Device Address field, type "S7;ETHERNET;N=xxx"  where xxx is the backend name. When you do this the Citect IO device name can be anything.

Please refer to the "PSDirect help" document for more information.


PSDirect, Communications, backend