Allen-Bradley 1756-CNB User Manual

Publication 1756-UM523F-EN-P - December 2006
Configure and Program the Controller 79
6. Keep code as compact as possible. Avoid checking the same conditions many times. Each instruction adds scan time to your
controller.
Action Details
This is better
This rung checks Bool_B and Bool_C only once each scan.
Than this
This rung checks Bool_B and Bool_C twice each scan. One or two instructions do not add much
scan time. But if you do this often, the extra instructions add up to a much longer scan time.

Allen-Bradley 1756-CNB Specifications

General

Brand	Allen-Bradley
Model	1756-CNB
Category	Control Systems
Language	English