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5 SEQUENCE INSTRUCTIONS
5.5 Master Control Instructions
■Applicable devices
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
These instructions are used to create an efficient ladder switching program by opening and closing the common rails of the
ladder.
The following is the program example using the master control instructions.
(Left: Display on the engineering tool, Right: Actual operation)
■MC
• If the execution command of the MC instruction is on when a master control starts, the operation result between the MC
and MCR instructions will be the one as programmed. If the execution command is off, the operation result between the MC
and MCR instructions will be as follows.
• Even if the MC instruction is off, the instructions between the MC and MCR instructions are executed and therefore the
scan time is not shortened.
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB,
FX, FY
J\ T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U\G, J\,
U3E\(H)G
Z LT, LST,
LC
LZ K, H E $ N DY
(N)
(d)
Operand Bit Word Indirect
specification
Constant Others
SA\X, SA\Y, SA\M, SA\SM, SA\B SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD K, H N
(N)
(d)
(1) Executed only when X0 is on.
Device Status
High-speed timer
Low-speed timer
The count value is set to 0, and both the coil and contact are turned off.
High-speed retentive timer
Low-speed retentive timer
Counter
The coil is turned off, but both the count value and contact maintain the current status.
Device used by the OUT instruction Forcibly turned off.
Device used by the SET and RST instructions
Device used by the SFT(P) instruction
Device used by basic instructions and application
instructions
Maintains the current status.
X0
X1
M0
N1
X3
M7
MC
M5
X6
X4
N1
MCR
X0F
M0
N1
X0
X1
M0
N1
X3
M7
MC
M5
X6
X4
N1
MCR
X0F
M0
N1
(1)
Y47
Y4F
Y40
Y47
Y4F
Y40
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