Instructions
9.1 PID_Compact
PID control
300 Function Manual, 03/2017, A5E35300227-AC
If several warnings are pending, the values of variable sd_warning are displayed by means
of binary addition. The display of warning 0003, for example, indicates that the warnings
0001 and 0002 are also pending.
The point of inflection was not found during pretuning.
Oscillation increased during fine tuning.
0004 The setpoint was outside the set limits.
0008 Not all the necessary controlled system properties were defined for the selected method of calculation.
The PID parameters were instead calculated using the "i_CtrlTypeTIR = 3" method.
The operating mode could not be changed because ManualEnable = TRUE.
0020 The cycle time of the calling OB limits the sampling time of the PID algorithm.
Improve results by using shorter OB cycle times.
The process value exceeded one of its warning limits.
The following warnings are deleted as soon as the cause is dealt with:
● 0004
● 0020
● 0040
All other warnings are cleared with a rising edge at Reset.
Calculate the standard deviation
Find the point of inflection
Static tags of PID_Compact V1 (Page 288)
Parameters State and sRet.i_Mode V1 (Page 293)
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