Siemens SIMATIC S7-1200 Function Manual page 290

Instructions
9.1 PID_Compact
Tag
sPid_Cmpt.r_Sp_Hlm
sPid_Cmpt.r_Sp_Llm
sPid_Cmpt.r_Pv_Norm_IN_1
sPid_Cmpt.r_Pv_Norm_IN_2
sPid_Cmpt.r_Pv_Norm_OUT_1
sPid_Cmpt.r_Pv_Norm_OUT_2
sPid_Cmpt.r_Lmn_Hlm
sPid_Cmpt.r_Lmn_Llm
sPid_Cmpt.b_Input_PER_On
sPid_Cmpt.b_LoadBackUp
sPid_Cmpt.b_InvCtrl
sPid_Cmpt.r_Lmn_Pwm_PPTm
290
Data type Default
REAL +3.402822e+
38
REAL -
3.402822e+3
8
REAL 0.0
REAL 27648.0
REAL 0.0
REAL 100.0
REAL 100.0
REAL 0.0
BOOL TRUE
BOOL FALSE
BOOL FALSE
REAL 0.0
Description
High limit of setpoint
If you configure sPid_Cmpt.r_Sp_Hlm outside the
process value limits, the configured process value
absolute high limit is used as the setpoint high limit.
If you set sPid_Cmpt.r_Sp_Hlm within the process
value limits, this value is used as the setpoint high
limit.
Low limit of the setpoint
If you set sPid_Cmpt.r_Sp_Llm outside the process
value limits, the configured process value absolute
low limit is used as the setpoint low limit.
If you set sPid_Cmpt.r_Sp_Llm within the process
value limits, this value is used as the setpoint low
limit.
Scaling Input_PER low
Input_PER is converted to percent based on the two
value pairs r_Pv_Norm_OUT_1, r_Pv_Norm_IN_1 and
r_Pv_Norm_OUT_2, r_Pv_Norm_IN_2 from the
sPid_Cmpt structure.
Scaling Input_PER high
Input_PER is converted to percent based on the two
value pairs r_Pv_Norm_OUT_1, r_Pv_Norm_IN_1 and
r_Pv_Norm_OUT_2, r_Pv_Norm_IN_2 from the
sPid_Cmpt structure.
Scaled low process value
Input_PER is converted to percent based on the two
value pairs r_Pv_Norm_OUT_1, r_Pv_Norm_IN_1 and
r_Pv_Norm_OUT_2, r_Pv_Norm_IN_2 from the
sPid_Cmpt structure.
Scaled high process value
Input_PER is converted to percent based on the two
value pairs r_Pv_Norm_OUT_1, r_Pv_Norm_IN_1 and
r_Pv_Norm_OUT_2, r_Pv_Norm_IN_2 from the
sPid_Cmpt structure.
Output value high limit for output parameter "Output"
Low output value limit for output parameter "Output"
If b_Input_PER_On = TRUE, then parameter In-
put_PER is used. If b_Input_PER_On = FALSE, then
parameter Input is used.
Activate the back-up parameter set. If an optimization
has failed, you can reactivate the previous PID pa-
rameters by setting this bit.
Invert control logic
With b_InvCtrl = TRUE, an increasing control devia-
tion causes a reduction in the output value.
The minimum ON time of the pulse width modulation
in seconds is rounded to
r_Lmn_Pwm_PPTm = r_Cycle or
r_Lmn_Pwm_PPTm = n*r_Cycle
Function Manual, 03/2017, A5E35300227-AC
PID control