Mitsubishi MELSEC QS Series Programming Manual page 92

MC, MCR
Program Example
(1) 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:
Ladderdisplayed in the GX Developer
ladder mode
A
N0 M15
B
N1 M16
C
N2 M17
5-40
5.4 Master Control Instructions
5.4.1 Setting and resetting the master control (MC, MCR)
[Ladder of actual operation]
MC N0 M15
N0
MC N1 M16
N1
MC N2 M17
N2 M17
N2
MCR
MCR N1
MCR N0
A
M15
B
M16
C
MC N0 M15
Executed when A
is ON
MC N1 M16
Executed when A
and B are ON
MC N2 M17
Executed when A, B
and C are ON
MCR N2
Executed when A
and B are ON
MCR N1
Executed when
A is ON
MCR N0
Not related to A, B
and C