Siemens SIMATIC S7-1200 Function Manual page 291

Tag
sPid_Cmpt.r_Lmn_Pwm_PBTm
sPid_Cmpt.r_Pv_Hlm
sPid_Cmpt.r_Pv_Llm
sPid_Cmpt.r_Pv_HWrn
sPid_Cmpt.r_Pv_LWrn
sPidCalc.i_Ctrl_IOutv
sParamCalc.i_Event_SUT
sParamCalc.i_Event_TIR
sRet.i_Mode
sRet.r_Ctrl_Gain
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default
REAL 0.0
REAL 120.0
REAL 0.0
REAL +3.402822e+
38
REAL -
3.402822e+3
8
REAL 0.0
INT 0
INT 0
INT 0
REAL 1.0
Description
The minimum OFF time of the pulse width modulation
in seconds is rounded to
r_Lmn_Pwm_PBTm = r_Cycle or
r_Lmn_Pwm_PBTm = n*r_Cycle
High limit of the process value
At the I/O input, the process value can be a maxi-
mum of 18% higher than the standard range (over-
range). An error is no longer reported for a violation
of the "Process value high limit". Only a wire-break
and a short-circuit are recognized and the
PID_Compact switches to "Inactive" mode.
r_Pv_Hlm > r_Pv_Llm
Low limit of the process value
r_Pv_Llm < r_Pv_Hlm
Warning high limit of the process value
If you set r_Pv_HWrn outside the process value lim-
its, the configured process value absolute high limit is
used as the warning high limit.
If you configure r_Pv_HWrn within the process value
limits, this value is used as the warning high limit.
r_Pv_HWrn > r_Pv_LWrn
r_Pv_HWrn ≤ r_Pv_Hlm
Warning low limit of the process value
If you set r_Pv_LWrn outside the process value limits,
the configured process value absolute low limit is
used as the warning low limit.
If you configure r_Pv_LWrn within the process value
limits, this value is used as the warning low limit.
r_Pv_LWrn < r_Pv_HWrn
r_Pv_LWrn ≥ r_Pv_LWrn
Current integral action
Variable i_Event_SUT (Page 300) indicates the cur-
rent phase of "pretuning":
Variable i_Event_TIR (Page 301) indicates the cur-
rent phase of "fine tuning":
The operating mode is changed edge-triggered.
The following operating mode is enabled on a change
to
i_Mode = 0: "Inactive" mode (controller stop)
•
i_Mode = 1: "Pretuning" mode
•
i_Mode = 2: "Fine tuning" mode
•
i_Mode = 3: "Automatic" mode
•
i_Mode = 4: "Manual" mode
•
i_Mode is retentive.
Active proportional gain
Gain is retentive.
Instructions
9.1 PID_Compact
291