Mitsubishi Electronics FX1S manual General Precautions When Using The FX-PCS/AT-EE Software

FX Series Programmable Controllers STL Programming 3

Further recommended program changes:

	S 20
X0			X10
X1		X4	X11

X14

Rewrite as...		S 20
	X0		X0	X10	X10
	X1		X4	X11	X14

	S 21		S 23		S 25		S 27
X2		X5		X12		X15
	S 22		S 24		S 26		S 28
X3		X6		X13		X16
X7				X17

S21

X2 S 22

X3

X7

	S 23		S 25		S 27
X5		X12		X15
	S 24		S 26		S 28
X6		X13		X16
X7		X17		X17

S 29

S 29

Program violation!

Rewrite as...

	S 20
X0				X1
	S 21		S 23		S 25		S 27
X2		X3		X4		X5
	S 22		S 24		S 26		S 28

X6

X7

	S 29
STL		S 20		STL	S 22
LD		X	0	STL	S 24
SET		S 21		LD	X	6
SET		S 23		SET	S 29
LD		X	1	STL	S 26
SET		S 25		STL	S 28
SET		S 27		LD	X	7
				SET	S 29

3.10General Precautions When Using The FX-PCS/AT-EE Software

FX1S FX1N FX2N FX2NC

This software has the ability to program in SFC flow diagrams. As part of this ability it can read and convert existing STL programs back into SFC flows even if they were never originally programmed using the FX-PCS/AT-EE software. As an aid to allowing this automatic SFC flow generation the following rules and points should be noted:

1)When an STL flow is started it should be initialized with one of the state devices from the range S0 to S9.

2)Branch selection or merging should always be written sequentially moving from left to right. This was demonstrated on page 3-11, i.e. on the selective branch S21 was specified before S31 which was specified before S41. The merge states were programmed in a similar manner, S29 proceeded S39 which proceeded S49.

3)The total number of branches which can be programmed with the STL programming mode are limited to a maximum of 16 circuits for an STL flow. Each branch point is limited to a maximum of 8 branching flows. This means two branch points both of 8 branch flows would equal the restriction. These restrictions are to ensure that the user can always view the STL flow diagram on the computer running the FX-PCS-AT/ EE software and that when it is needed, the STL program flow can be printed out clearly.

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