Mitsubishi MELSEC QCPU User Manual

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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
High Performance
QnA Q4AR
Basic
QCPU
PLC CPU
Process CPU
5.2.4 Operation result pulse conversion (MEP, MEF)
Usable Devices
Internal Devices
(System, User)
MELSECNET/10(H)
Direct J
\
Other
Set
Data
Bit Word
File
Register
Bit Word
Special
Function
Module
U
\G
Index
Register
Zn
Constant
K, H
U
[Instruction Symbol] [Execution Condition]
MEP
MEF
[Functions]
MEP
(1) If operation results up to MEP instruction are leading edge (from OFF to ON), goes ON
(continuity status).
If operation results up to MEP instruction are anything other than leading edge, goes OFF
(non-continuity status).
(2) Use of the MEP instruction simplifies pulse conversion processing when multiple contacts are
connected in series.
MEF
(1) If operation results up to MEF instruction are trailing edge (from ON to OFF), goes ON
(continuity status).
If operation results up to MEF instruction are anything other than trailing edge, goes OFF (non-
continuity status).
(2) Use of the MEF instruction simplifies pulse conversion processing when multiple contacts are
connected in series.
[Operation Errors]
(1) There are no operation errors associated with the MEP or MEF instructions.
[Program Example]
(1) A program which performs pulse conversion on the operation results of X0 and X1:
[Ladder Mode] [List Mode]
Instruction
Steps
Device
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Mitsubishi MELSEC QCPU Specifications

General

Brand	Mitsubishi
Model	MELSEC QCPU
Category	Controller
Language	English