8 -2
8.2
Basic Formation of Step Ladder Diagram
c
Single path
STP S20
STP S21
X0
z
Step S20 alone moves to step S21 through X0.
z
X0 can be changed to other serial or parallel
combination of contacts.
d
Selective divergence/convergence
STP S40
X21
STP S31
X22
STP S32
STP S22
X1
STP S23
X2
Selective divergence
Selective convergence
X0
X20
STP S21
STP S30
STP S20
z
Step S20 selects an only one path which divergent
condition first met. E.g. X2 is ON first, then only the path
of step S23 will be executed.
z
A divergence may have up to 8 paths maximum.
z
X1, X2, ….., X22 can all be replaced by the serial or
parallel combination of other contacts.
e
Simultaneous divergence/convergence
STP S21
STP S30
STP S40
STP S20
STP S22
STP S31
STP S23
STP S32
X1
X0
Simultaneous divergence
Simultaneous convergence
z
After X0 is ON, step S20 will simultaneously execute all
paths below it, i.e. all S21, S22, S23, and so on, are in
action.
z
All divergent paths at a convergent point will be executed
to the last step (e.g. S30, S31 and S32). When X1 is ON,
they can then transfer to S40 for execution.
z
The number of divergent paths must be the same as the
number of convergent paths. The maximum number of
divergence/convergence path is 8.
Содержание FBs-CBE
Страница 78: ...MEMO ...
Страница 111: ...4 6 X0 X1 Node A Y0 Y1 Node B differential down Incerse differential up t Scan time Inverse t t ...
Страница 141: ...Basic Function Instruction 6 16 FUN 2 SKP SKIP START FUN 2 SKP Y2 Y1 Y0 T201 10S X0 X1 X2 0 10 0 ...
Страница 305: ...MEMO ...
Страница 348: ...MEMO ...