Applies To:
  • CitectSCADA 5.xx

I have an Allen Bradley PLC5/40 and want to communicate to it from Citect using a serial cable to the programming port (CH0) what special settings do I need? 

The Citect KE5 driver can communicate via this method. This is a half duplex driver using the DF1 protocol and with BCC error correction.

The PLC5 Channel 0 must be configured with the following -

Communications Mode: System (slave)

Serial Port - Error Detect: BCC Control Line: No Handshaking

Also note the Station Addr under Options, as this needs to be set as the Citect IODevice address.

Citect should then be configured using to following settings (see also Citect Help Topics for more details) with a separate port used for each PLC -

Boards - Board Type: COMX

Ports - Port Number: Windows com port #

IODevices - Protocol: KE5 Address: Station Addr of the PLC in Octal (eg. 2)

Note: The current version of the driver does not work with Station Addr 20. CIT has confirmed this to be a problem in KE driver v2.0 and we are researching this problem and will post new information here as it becomes available. Also note that using Station Addr 1 may conflict with RSLinx if you are attempting to communicate from RSLinx to program the PLC.