Mitsubishi Electronics FX1S manual General Rules For Successful STL Branching, Instruction Format

FX Series Programmable Controllers STL Programming 3

3.9General Rules For Successful STL Branching

For each branch point 8 further branches may be programmed. There are no limits to the num- ber of states contained in a single STL flow. Hence, the possibility exists for a single initial state to branch to 8 branch flows which in turn could each branch to a further 8 branch flows etc. If the programmable controllers program is read/written using instruction or ladder formats the above rules are acceptable. However, users of the FX-PCS/AT-EE programming package who are utilizing the STL programming feature are constrained by further restrictions to enable automatic STL program conversions (please see page 3-15 for more details).

When using branches, different types of branching /merging cannot be mixed at the same branch point. The item marked with a ‘S’ are transfer condition which are not permitted.

The following branch configurations/modifications are recommended:

	S 20		S 30		S 40
X0		X1		X2
X3		X4
	S 50		S 60

S 20 S 30 S 40

X0

S 50 S 60

S 20 S 30

X0 X1

S 40 S 50

S 20 S 30

X0

X1 X2

S 40 S 50

Rewrite as Rewrite as

S 20

S 30

S 40

S 20

S 30

S 40

X0

X1

X2

X0

Dummy

Dummy state

S 100

S 101

state

(S100)

(S100)

(S101)

X3

X4

S 50

S 60

S 50

S 60

	S 20				S 30			S 20			S 30
X0			X1
							X0				Dummy
				Dummy
	S 102							S 103
				state							state
		(S102)
						(S103)			(S103)
							X1			X2
	S 40				S 50			S 40			S 50

In Instruction	In Instruction
format...	format...

STL S 20 LD X 0 SET S 100 STL S 30 LD X 1 SET S 100 STL S 40 LD X 2 SET S 100 STL S 100 LD S 100 AND X 3 SET S 50 LD S 100 AND X 4 SET S 60

STL S 20 STL S 30 STL S 40 LD X 0 SET S 101 STL S 101 LD S 101 SET S 50 SET S 60

STL S 20 LD X 0 SET S 102 STL S 30 LD X 1 SET S 102 STL S 102 LD S 102 SET S 40 SET S 50

STL S 20 STL S 30 LD X 0 SET S 103 STL S 103 LD S 103 AND X 1 SET S 40 LD S 103 AND X 2 SET S 50

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