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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
High Performance
QnA Q4AR
Basic
QCPU
PLC CPU
Process CPU
5.2.2 Operation results push, read, pop (MPS, MRD, MPP)
Usable Devices
Internal Devices
(System, User)
MELSECNET/10(H)
Direct J
\
Set
Data
Bit Word
File
Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
K, H
Other
[Instruction Symbol] [Execution Condition]
MPS, MRD, and MPP are not displayed as a part of the ladder display.
MPS
MRD
MPP
[Functions]
MPS
(1) Stores in memory the operation result (ON or OFF) immediately prior to the MPS instruction.
(2) Up to 16 MPS instructions can be used successively.
However, only up to 11 can be created in the ladder mode.
If an MPP instruction is used during this process, the number of uses calculated for the MPS
instruction will be decremented by one.
MRD
(1) Reads the operation result stored for the MPS instruction, and uses that result to perform the
operation in the next step.
MPP
(1) Reads the operation result stored for the MPS instruction, and uses that result to perform the
operation in the next step.
(2) Clears the operation results stored by the MPS instruction.
(3) Subtracts 1 from the number of MPS instruction times of use.
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