Relay Ladder; Structured Text; Control A Ratio - Allen-Bradley Logix5000 Reference Manual

Chapter 13 Special Instructions (FBC, DDT, DTR, PID)
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Relay Ladder

Structured Text

PID(master,pv_master,0,cv_master,0,0,0);
PID (slave,pv_slave,0,cv_slave,master,0,0);

Control a Ratio

You can maintain two values in a ratio by using these parameters:
· Uncontrolled value
· Controlled value (the resultant setpoint to be used by the PID instruction)
· Ratio between these two values
Relay Ladder
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011