Instructions
9.4 PID basic functions
PID control
454 Function Manual, 03/2017, A5E35300227-AC
LMN_HLM REAL 100.0 The manipulated value is always restricted to a high limit and low limit. The "High
limit of manipulated value" input specifies the high limit.
Permissible are real values starting at LMN_LLM or a physical variable 2).
LMN_LLM REAL 0.0 The manipulated value is always restricted to a high limit and low limit. The "Low
limit of manipulated value" input specifies the low limit.
Permissible are real values up to LMN_HLM or a physical variable 2).
PV_FAC REAL 1.0 The "Process value factor" input is multiplied by the process value. The input is
used to scale the process value range.
PV_OFF REAL 0.0 The input "Process value offset" is added to the process value. The input is used to
scale the process value range.
LMN_FAC REAL 1.0 The "Manipulated value factor" input is multiplied with the manipulated value. The
input is used to scale the manipulated value range.
LMN_OFF REAL 0.0 The input "Manipulated value offset" is added to the process value. The input is
used to scale the manipulated value range.
I_ITLVAL REAL 0.0 The output of the integral action can be set at the I_ITL_ON input. The initialization
value is applied to the input "Initialization value of the I-action."
Permissible are values of -100.0 to 100.0 (%) or a physical variable 2).
DISV REAL 0.0 For feedforward control, the disturbance variable is interconnected to the "Disturb-
ance variable" input.
Permissible are values of -100.0 to 100.0 (%) or a physical variable 2).
1) Parameters in the setpoint and process value branches with the same unit
2) Parameters in the manipulated value branch with the same unit
Table 9- 14 Output parameters CONT_C
LMN REAL 0.0 The effective "Manipulated value" is output in floating point format at the "Manipu-
LMN_PER WORD W#16#000
The manipulated value in I/O format is interconnected on the input "Manipulated
value I/O" with the controller.
QLMN_HLM BOOL FALSE The manipulated value is always restricted to a high limit and low limit. The output
"High limit of manipulated value reached" indicates that the high limit has been
reached.
QLMN_LLM BOOL FALSE The manipulated value is always restricted to a high limit and low limit. The output
"Low limit of manipulated value reached" indicates that the low limit has been
The "P-action" output contains the proportional action of the manipulated variable.
The "I-action" output contains the integral action of the manipulated variable.
The "D-action" output contains the derivative action of the manipulated variable.
The effective process value is output at the "Process value" output.
The effective system deviation is output at the "Error signal" output.
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