Installation manual

Publication 1747-RM001G-EN-P - November 2008
9-22 Proportional Integral Derivative Instruction
41H Scaling Selected Scaling Deselected Scaling Selected Scaling Deselected
1. Deadband < 0, or 1. Deadband < 0, or Change deadband to
0 <
deadband <
(Smax - Smin) <
16383
Change deadband to
0 <
deadband < 16383
2. Deadband
>
(Smax - Smin), or
2. Deadband >
16383
3. Deadband > 16383
(5/02 specific)
51H 1. Output high limit < 0, or
2. Output high limit > 100
Change output high limit to
0 <
output high limit < 100
52H 1. Output low limit < 0, or
2. Output low limit > 100
Change output low limit to
0 <
output low limit < output high limit < 100
53H Output low limit > output high limit Change output low limit to
0 <
output low limit < output high limit < 100
60H SLC 5/02 - PID is being entered for the second time. (PID
loop was interrupted by an I/O interrupt, which is then
interrupted by the PID STI interrupt.
You have at least three PID loops in your program: One in
the main program or subroutine file, one in an I/O
interrupt file, and one in the STI subroutine file. You must
alter your ladder program and eliminate the potential
nesting of PID loops.
Table 9.36 PID Instruction Runtime Errors
Error Code Description of Error Condition or Conditions Corrective Action