5. Sequential Function Chart
3. Structure of Simultaneous Convergence
Consecutive STL instructions construct a simultaneous convergence structure. When the
transition condition is true after continuous steps, the operation will be transferred to next step.
In simultaneous convergence, only when all sequences are completed will the transfer be
allowed.
Ladder diagram of simultaneous convergence:
SFC diagram of simultaneous convergence:
4. Structure of Alternative Convergence
The following ladder explains the structure of alternative convergence. Program operation will
transfer to S60 as long as one of the transition conditions of S30, S40 or S50 is ON.
Ladder diagram of alternative convergence:
X0
SET
SET S60
S60
S
SET S60
S30
X1
X2
S
S40
S
S50
SFC diagram of alternative convergence:
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