Instructions
9.2 PID_3Step
PID control
352 Function Manual, 03/2017, A5E35300227-AC
PID_3Step V1 output parameters
Table 9- 11 PID_3Step V1 output parameters
ScaledFeedback REAL 0.0 Scaled position feedback
For an actuator without position feedback, the position of the
actuator indicated by ScaledFeedback is very imprecise.
ScaledFeedback may only be used for rough estimation of the
current position in this case.
Output_UP BOOL FALSE Digital output value for opening the valve
If Config.OutputPerOn = FALSE, the Output_UP parameter is
Output_DN BOOL FALSE Digital output value for closing the valve
If Config.OutputPerOn = FALSE, the Output_DN parameter is
Output_PER WORD W#16#0 Analog output value
If Config.OutputPerOn = TRUE, Output_PER is used.
Use Output_PER if you are using a valve as actuator which is
triggered via an analog output and controlled with a continu-
ous signal, e.g. 0...10 V or 4...20 mA.
The value at Output_PER corresponds to the target position of
the valve, e.g. Output_PER = 13824, when the valve is to be
SetpointLimit_H BOOL FALSE If SetpointLimit_H = TRUE, the absolute setpoint high limit is
reached. In the CPU, the setpoint is limited to the configured
absolute setpoint high limit. The configured absolute process
value high limit is the default for the setpoint high limit.
If you configure Config.SetpointUpperLimit to a value within
the process value limits, this value is used as the setpoint high
limit.
SetpointLimit_L BOOL FALSE If SetpointLimit_L = TRUE, the absolute setpoint low limit has
been reached. In the CPU, the setpoint is limited to the con-
figured absolute setpoint low limit. The configured absolute
process value low limit is the default setting for the setpoint
low limit.
If you configure Config.SetpointLowerLimit to a value within
the process value limits, this value is used as the setpoint low
InputWarning_H BOOL FALSE If InputWarning_H = TRUE, the process value has reached or
exceeded the warning high limit.
InputWarning_L BOOL FALSE If InputWarning_L = TRUE, the process value has reached or
fallen below the warning low limit.
To Next Page
Loading...
Need help?
General
