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PID in MicroLogix

D

Thread Starter

dane

Hello

Does anyone have a short snippet of code which show how to impliment a PID block in a micrologix 1500 processor.

Thanks in advance.
 
T

Ting

Hi Dane! The structure of PID programming in MicroLogix is similar to SLC 500. You have the Control Block, Process, and Control Variable. The PID only allows a scaled value of 0-100 so you need to re-scale the input and output (4-20mA). You can also include in the ladder the Auto/Manual bit, PID Mode enable bit (direct/reverse acting) so that it is easier to link if you want to use third party HMIs. Email-me if you have further question.

Ting
ting@ icisystems.net
 
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