Tag Sd_Warning V1; Tag I_Event_Sut V1 - Siemens SIMATIC S7-1200 Function Manual

Instructions
9.1 PID_Compact
9.1.5.8

Tag sd_warning V1

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.
sd_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 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.
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.
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.
9.1.5.9

Tag i_Event_SUT V1

i_Event_SUT Name
0 SUT_INIT
100 SUT_STDABW
200 SUT_GET_POI
9900 SUT_IO
1 SUT_NIO
See also
Static tags of PID_Compact V1 (Page 288)
Parameters State and sRet.i_Mode V1 (Page 293)
300
Description
Initialize pretuning
Calculate the standard deviation
Find the point of inflection
Pretuning successful
Pretuning not successful
Function Manual, 03/2017, A5E35300227-AC
PID control