5. SEQUENCE INSTRUCTIONS
5
−
30
MELSEC-A
5.5 Master Control Instructions
5.5.1 Master control set, reset (MC, MCR)
Available Device
Bit device
Word (16-bit) device
Constant
Pointer
Level
Ca
rr
y
fla
g
Err
o
r
fla
g
X Y M L S B F T C D W R A0
A1
Z V K H P I N
D
igit specification
Inde
x
M9012 (M9010, M9011)
n
O
(D)
O
O
O
O
O
O
*1: Index qualification can be used with AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board only.
Functions
The MC instruction is used to allow the sequence program to perform efficient circuit
switching by opening and closing the common bus of circuits. The figure below
shows an example of circuit when the MC instruction is used.
REMARK
When a program is written in the ladder mode of GPP, it is not necessary to input contacts on the
bus. Those contacts are displayed automatically by performing conversion.
*1
Applicable
CPU
All CPUs
ON/OFF command for MC
MC
MCR
n
n
(D)
n
Nesting (N0 to 7)
(D)
Device number to be
turned on
Setting data
(D)
←
Device
Nesting (N0 to 7)
n
(
)
(
)
(
)
Circuit in the ladder mode of GPP
Actual operation circuit
Executed
only when
X0 is ON.
X000
N1 M0
MC N1 M0
Y047
Y04F
X001 X003 M7
M5
X006 X004
MCR N1
Y010
X00F
Summary of Contents for MELSEC-A series
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