Tag Warning V1 - Siemens SIMATIC S7-1200 Function Manual

Instructions
9.2 PID_3Step
9.2.5.10

Tag Warning V1

If several warnings are pending simultaneously, their values are displayed with binary
addition. The display of warning 0003, for example, indicates that the warnings 0001 and
0002 are pending simultaneously.
Warning Description
(DW#16#...)
0000 No warning pending.
0001 The point of inflection was not found during pretuning.
0002 Oscillation increased during fine tuning.
0004 The setpoint was limited to the configured 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 TuneRuleTIR = 3 method.
0010 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.
0040 The process value exceeded one of its warning limits.
0080 Invalid value at Retain.Mode. The operating mode is not switched.
0100 The manual value was limited to the limits of the controller output.
0200 The rule used for tuning produces an incorrect result, or is not supported.
0400 Method selected for transition time measurement not suitable for actuator.
The transition time cannot be measured because the actuator settings do not match the selected meas-
uring method.
0800 The difference between the current position and the new output value is too small for transition time
measurement. This can produce incorrect results. The difference between the current output value and
new output value must be at least 50% of the entire control range.
1000 The substitute output value cannot be reached because it is outside the output value limits.
The following warnings are deleted as soon as the cause is eliminated:
● 0004
● 0020
● 0040
● 0100
All other warnings are cleared with a rising edge at Reset.
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Function Manual, 03/2017, A5E35300227-AC
PID control