Allen-Bradley LOGIX 5000 Reference Manual page 100

Chapter 1 Process Control Instructions
Updating the CVOper and CVProg Values
If not in the Operator Manual mode, the PIDE instruction sets CVOper = CV.
This obtains bumpless mode switching from any control to the Operator Manual
mode.
Primary Loop Control
Primary loop control is typically used by a primary PID loop to obtain bumpless
switching and anti-reset windup when using Cascade/Ratio mode. The primary
loop control includes the initialize primary loop output and the anti-reset windup
outputs. The InitPrimary output is typically used by the CVInitReq input of a
primary PID loop. The windup outputs are typically used by the windup inputs of
a primary loop to limit the windup of its CV output.
(1) During instruction first scan, the instruction sets InitPrimary.
(2) When CVInitializing is set or when not in Cascade/Ratio mode the
instruction sets InitPrimary.
(3) When CVInitializing is cleared and in Cascade/Ratio mode, the instruction
clears InitPrimary.
100 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018