Schneider M221 Ladder Function

Andrew EPS

Lifetime Supporting Member
Join Date
Mar 2015
Location
Brisbane
Posts
12
Hi Guys,
I'm converting a Zelio program (in FBD) to an M221 (Ladder) and having a brain issue.

I am monitoring two analog inputs. When both analogs are above a set value for a set time, I want to energise an output. In the Zelio, I used a Schmitt trigger so I had hysteresis (deadband), but am unsure how to achieve this in ladder in the M221.


Any help would be greatly appreciated.
 
Just break it down into small chunks.

Monitor both inputs, 2x GRT than n °C starts a TON, when TON is done write output.
 

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