5 SEQUENCE INSTRUCTIONS
5.5 Master Control Instructions
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The master control instruction can be used in nesting. The different master control regions are distinguished by nesting (N).
Nesting can be performed from N0 to N14.
The use of nesting enables the creation of ladders which successively limit the execution condition of the program.
A ladder using nesting would appear as shown below:
MC N0 M15
MC
N1
M16
MC
N2 M17
MCR N2
MCR N1
MCR N0
N0
M15
N1 M16
N2 M17
A
B
C
MC N0 M15
MC
N1
M16
MC N2 M17
MCR N2
MCR N1
MCR N0
N0
M15
N1 M16
N2 M17
A
B
C
Not related to
the status of
A, B or C.
Executed
when A is ON.
Executed
when A is ON.
Executed
when A and
B are ON.
Executed
when A and
B are ON.
Executed
when A, B
and C are ON.
[Ladder as displayed in the GPP ladder mode] [Ladder as it actually operates]
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