Siemens SIMATIC S7-1200

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
609
10.2.3.3
PID_3Step instruction Warning parameters
If the PID controller has several warnings pending, it displays the values of the error codes
by means of binary addition. The display of error code 0003, for example, indicates that the
errors 0001 and 0002 are pending.
Table 10- 25 PID_Compact instruction Warning parameters
Warning (DW#16#...)
Description
0000
No warning pending.
0001
1
The point of inflection was not found during pretuning.
0002 Oscillation was enforced during “tuning in run”. (The "Warning" parameter suppresses this
warning and is only visible in the “WarningInternal” parameter for diagnostic purposes.)
0004
1
The setpoint was limited to the configured limits.
0008
1
Not all the necessary controlled system properties were defined for the selected method of
calculation. Instead, the PID parameters were calculated using the TIR.TuneRuleHeat /
TIR.TuneRuleCool = 3 method.
0010 The operating mode could not be changed because Reset = TRUE or ManualEnable =
TRUE.
0020 The cycle time of the calling OB limits the sampling time of the PID algorithm. Improve re-
sults by using shorter OB cycle times.
0040
1
The process value exceeded one of its warning limits.
0080
Invalid value at Mode. The operating mode is not switched.
0100
1
The manual value was limited to the limits of the controller output.
0200
The specified rule for tuning is not supported. No PID parameters are calculated.
1000
The substitute output value cannot be reached because it is outside the output value limits.
1
Note: The PID controller deleted the following warnings automatically as soon as the cause is eliminated or the user
action repeated with valid parameters: 0001, 0004, 0008, 0040, and 0100.