Applies To:
  • CitectSCADA
Summary:
 Slow communications to the Allen Bradley SLC 5/05 PLCs may be evident from excessive time to open pages.  

Solution:
 A customer has reported significant performance improvement after clearing the Comms Servicing Sel switch in the PLC.  

Comms Servicing Sel S:2/15

When set (1), only one communication request will be serviced per END, TND, REF, or SVC instruction.  When clear all serviceable incoming or outgoing requests will be serviced per instruction.

When clear, your communication throughput will increase.  Your scan time will also increase if several communication commands/requests are received in the same scan. 
Keywords:
 SLC, ABTCP

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