Grafcet objects

Introduction

Conversion replaces the PL7 objects by their Control Expert equivalent.

Grafcet objects

The following table describes any correspondence and differences between PL7 and Control Expert objects.

	PL7		Control Expert		Status
	Syntax	Type of data	Syntax	Type of data	Status
Grafcet objects	%Xi	BOOL	X_i.x	SFCSTEP_STATE	Modified (1)
	%XMj		XM_j.x
	%Xj.i		X_j_i.x
	%Xj.IN		X_j_IN.x
	%Xj.OUT		X_j_OUT.x
Grafcet objects	%Xi.T	WORD	X_i.t	SFCSTEP_STATE	Modified (1)
	%XMj.T		XM_j.t
	%Xj.i.T		XM_j_i.t
	%Xj.IN.T		XM_j_IN.t
	%Xj.OUT.T		XM_j_OUT.t

Legend:
(1)	PL7 steps and macrosteps become, in Control Expert, structured objects SFCSTEP_STATE. For the activity times of the steps, we advise you to check your program in order to use the TIME type instead of the a whole value, converted into PL7.

Grafcet words and bits

The following table describes the correspondence and possible differences between Grafcet words and bits.

	PL7	Control Expert	Status
	Syntax	Syntax	Status
Indexed Grafcet words and bits	%Xi[%MWj]	%Mi[%MWj]	Modified (1)
Indexed Grafcet words and bits	%Xi.T[%MWj]	-	Deleted (2)
Grafcet words and bits table	%Xi:L	%Mi:L	Modified (1)
Grafcet words and bits table	%Xi.T:L	-	Deleted (2)

Legend:
(1)	The objects of steps are no longer contiguous in the memory. Therefore, a set of %Mi objects is assigned by the PL7 application converter to simulate indexed Grafcet words or bits and the tables of Grafcet words or bits.
(2)	You must replace these objects manually in the program.