Matthew01

Ladder Logic

9 posts in this topic

Afternoon  All,

I am a complete novice to PLC's and have been given a project to write a relay ladder logic program using logic functions such as; AND, NAND, OR, NOR, XOR, NOT for the following two systems,

A traffic light system for a T-junction

& An air conditioning system with both heating and cooling features.

Please can someone help on this!!

Matt.

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We had cool assignments in my PLC class but I always wanted to do an HVAC control, this guy is lucky.

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Gosh I'm jealous of this guy's homework, I can't stop thinking about it.

For his HVAC, could/would you do a PID in gates, or would you do bang-bang?

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When you say PID in gates do you mean code it from scratch using ladder?

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I meant PID code it from scratch. Still pretty new and didn't know about things like "five minute PID" other drag 'n drop functions.

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I still prefer coding it from scratch.  It gives you more of a feel as to what the variables do in the process.  

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