Pid_3Step; New Features Of Pid_3Step - Siemens SIMATIC S7-1200 Function Manual

Instructions

9.2 PID_3Step

9.2 PID_3Step
9.2.1

New features of PID_3Step

PID_3Step V2.3
● As of PID_3Step Version 2.3 the monitoring and limiting of the travel time can be
deactivated with Config.VirtualActuatorLimit = 0.0.
PID_3Step V2.2
● Use with S7-1200
As of PID_3Step V2.2, the instruction with V2 functionality can also be used on S7-1200
with firmware version 4.0 or higher.
PID_3Step V2.0
● Reaction to error
The reaction to ActivateRecoverMode = TRUE has been completely overhauled.
PID_3Step reacts in a more fault tolerant manner in the default setting.
You use the ErrorAck input parameter to acknowledge the errors and warnings without
restarting the controller or clearing the integral action.
Switching operating modes does not acknowledge errors that are no longer pending.
● Switching the operating mode
You specify the operating mode at the Mode in/out parameter and use a positive edge at
ModeActivate to start the operating mode. The Retain.Mode tag has been omitted.
The transition time measurement can no longer be started with GetTransitTime.Start, but
only with Mode = 6 and a positive edge at ModeActivate.
● Multi-instance capability
You can call up PID_3Step as multi-instance DB. No technology object is created in this
case and no parameter assignment interface or commissioning interface is available. You
must assign parameters for PID_3Step directly in the multi-instance DB and commission
it via a watch table.
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NOTICE
Your system may be damaged.
If you use the default setting, PID_3Step remains in automatic mode even if the process
value limits are exceeded. This may 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.
Function Manual, 03/2017, A5E35300227-AC
PID control