Allen-Bradley LOGIX 5000 Reference Manual page 92

Chapter 1 Process Control Instructions
Updating the SPOper and SPProg Values
The PIDE instruction makes SPOper = SP or SPProg = SP to obtain bumpless
control switching between Program and Operator control or when switching from
Cascade/Ratio mode.
PV High/Low Alarming
The high-high to low-low alarming algorithm compares PV to the PV alarm limits
and the PV alarm limits plus or minus the PV alarm deadband
(1) During instruction first scan, the instruction clears all the PV alarm outputs.
The instruction also clears the PV alarm outputs and disables the alarming
algorithm when PVFaulted is set.
92 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018