IMO Precision Controls K7 Series User Manual page 103

Chapter 7 Usage of Various Functions
a) Error codes of auto-tuning function block (PID8AT)
The following table shows error codes and descriptions of PID8AT instruction.
Error code
(STAT output)
Description
0 Normal operation
1 SV is out of range
2 PV is out of range
3 S_TIME is out of range
32 Ripple is out of range
Change the SV within 0 ~ 4000
It may caused by fault of A/D module. Check the A/D
module.
Change the S_TIME within 0 ~ 100
Change the Ripple to 0 Or 1.
7-
Countermeasure