Using PID_Compact
4.2 PID_Compact V2
PID control
Function Manual, 03/2017, A5E35300227-AC
81
Output value V2
Output value limits
In the "Output value limits" configuration window, configure the absolute limits of your output
value in percent. Absolute output value limits are not violated in neither manual mode nor
automatic mode. If an output value outside the limits is specified in manual mode, the
effective value is limited in the CPU to the configured limits.
The output value limits must match the control logic.
The valid output value limit values depend on the Output used.
Your system may be damaged.
If you output "Current value while error pending " or "Substitute output value while error
pending" in the event of an error, PID_Compact remains in automatic mode. This may
cause a violation of the process value limits and damage your system.
It is essential to configure how your controlled system reacts in the event of an error to
protect your system from damage.
PID_Compact is preset so that the controller stays active in most cases in the event of an
error. If errors occur frequently in controller mode, this default reaction has a negative effect
on the control response. In this case, check the Errorbits parameter and eliminate the cause
of the error.
PID_Compact generates a programmable output value in response to an error:
● Zero (inactive)
PID_Compact outputs 0.0 as output value for all errors and switches to "Inactive" mode.
The controller is only reactivated by a falling edge at Reset or a rising edge at
ModeActivate.
● Current value while error is pending
If the following errors occur in
, PID_Compact returns to automatic mode
as soon as the errors are no longer pending.
If one or more of the following errors occur, PID_Compact stays in
automatic mode:
– 0001h: The "Input" parameter is outside the process value limits.
– 0800h: Sampling time error
– 40000h: Invalid value at Disturbance parameter.
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