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App. - 13
Appendix 4.8 Ladders with a common line
The following ladder cannot be operated as it is. To make such ladders controllable,
use master control instructions (MC, MCR) in the program.
X0
Manual
X1
Automatic
X4 X3 Y71
Y70
X2
X7 Y79 X2
Y71
X6
X7
Y71
Relay ladder
Project name QA-1
Program name MAIN
Sequence program with master control instructions
X0
X2
0
4
M1N0MC
Manual circuit
X1
M10
X6
6
M11
X7
9
N0MCR
X1
X4
10
14
M2N0MC
X0
M20
X7
17
M21
Y79
20
N0MCR
X3
M10
21
Y70
Y71
M20
M11
25
Y71
X2
M21
Y71
Automatic circuit
Common circuit
Note) In GX Works2, the on/off status of the master control is displayed in the title tag on the monitor screen.