5-50
5.5 Master Control Instructions
5.5.1 Setting and resetting master control
MC, MCR
Cautions when using nesting architecture
(1) Nesting can be used up to 15 times (N0 to N14)
When using nesting, nests should be inserted from the lower to higher nesting number with
the MC instruction, and from the higher to the lower order with the MCR instruction.
If this order is reversed, there will be no nesting architecture, and the CPU module will not be
capable of performing correct operations. For example, if nesting is specified in the order N1
to N0 by the MC instruction, and also specified in the N1 to N0 order by the MCR instruction,
the vertical bus will intersect and a correct master control ladder will not be produced.
(2) If the nesting architecture results in MCR instructions concentrated in one location, all
master controls can be terminated by use of just the lowest nesting number.
X1
X2
X
3
MC
EN ENO
n
*
M
15
0
MC
EN ENO
n
*
M
16
1
MC
EN ENO
n
*
M
1
7
2
MCR
EN ENO
n
*
0
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
Page 815: ......