Siemens SIMATIC S7-1200

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
621
ErrorBit (DW#16#...)
Description
4000000 Error starting fine tuning. “Heat.EnableTuning” and “Cool.EnableTuning”
cannot be set at the same time.
8000000 Error during PID parameter calculation resulted in invalid parameters (for
example, negative Gain; the current PID parameters remain unchanged and
tuning has no effect).
1
Note: If automatic mode was active before the error occurred and ActivateRecoverMode = TRUE,
PID_Temp remains in automatic mode.
2
Note: If pre-tuning or fine tuning mode was active before the error occurred and ActivateRecover-
Mode = TRUE, PID_Temp switches to the operating mode that is saved in the Mode parameter.
3
Note: If automatic mode was active before the error occurred and ActivateRecoverMode = TRUE,
PID_Compact outputs the configured substitute output value. As soon as the error is no longer
pending, PID_Temp switches back to automatic mode.
4
Note: If ActivateRecoverMode = TRUE before the error occurred, PID_Temp cancels the tuning
and switches to the operating mode that is saved in the Mode parameter.
10.2.4.3
PID_Temp 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- 29 PID_Temp 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” parame-
ter 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, th
e PID parameters were calculated
using the TIR.TuneRuleHeat / TIR.TuneRuleCool = 3 method.
0010 The operating mode could not be changed because Reset = TRUE or Man-
ualEnable = TRUE.
0020 The cycle time of the calling OB limits the sampling time of the PID algo-
rithm. Improve results 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 calcu-
lated.
1000 The substitute output value cannot be reached because it is outside the
output value limits.
4000 The specified output selection for heating and/or cooling is not supported.
Only OutputHeat and OutputCool are active.