View source for Template:Making multi-step configuration changes using trigger subroutines

Where multiple steps are required to re-configure a unit operation, the steps may need to be broken up between the different trigger subroutines so that they are executed in series.

Two examples are shown here:
#In this example, a [[Filter Press]] model is required to be turned on, the method changed and a parameter set. Since the parameter may not be available until the method selection is made, these will be performed in different subroutines.
#In this example, the PID controller block can be switched on / off based on a trigger variable (true/false).
{|
!width=50%|Example1 !! width=50%|Example2
|-
|<syntaxhighlight lang="pgm">
Sub InitialisePreStart()
 ;--- Logic executed very early before first iteration
 ; Turn on filter press FP_001
 ["FP_001.On"] = 1

EndSub
 
Sub PreStart()
 ;--- Logic executed early before first iteration
 ; Set method in filter press FP_001 to FiltrateConcAt25C
 ["FP_001.Method"] = 1
EndSub

Sub InitialiseSolution()
 ;--- Logic executed during initialisation before first iteration
 ; Set required filtrate solid concentration in filter press FP_001
 ["FP_001.FiltrateSolidConc25Reqd (g/L)"] = 2

EndSub
</syntaxhighlight>
|Valign=top|
<syntaxhighlight lang="pgm">
Sub PreStart()
 ;--- Logic executed early before first iteration
 ; example for switching PID control block on/off based on trigger:
  if UsePID_Control
	["Acid_Control.Cfg.[2].On"] = 0
  Else
	["Acid_Control.Cfg.[2].On"] = 1
  Endif
EndSub</syntaxhighlight>
|}