Prescan init.


Thread Starter

Stan Brown

My day for random thoughts :)

Heres another, this one related to the logic engines, specificly ladder logic ones.

One of the not so obvious subtleties of ladder logic processors, is the "prescan init" Where things line bits which are the operand of -()- instructions are reset to the off state.

Need to keep this one in mind.

Also need to remember that speed is a huge issue for PLC's I visited 2 today, and a quick look at both showed scan time in the sub 10 millisecond range. Lets keep efficiency as a priority goal.

Stan Brown [email protected] 843-745-3154
Charleston SC.
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