Operation Result Pulse Conversion (Mep, Mef) - Mitsubishi MELSEC QS Series Programming Manual

MEP, MEF
5.2.4

Operation result pulse conversion (MEP, MEF)

MEP, MEF
MEP
MEF
Function
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 Error
(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]
5-14
5.2 Connection Instructions
5.2.4 Operation result pulse conversion (MEP, MEF)
Command
Command
Internal Devices
Set
Data
Bit Word
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Because the MEP and MEF instructions operate according to the operation result
immediately before the execution of these instructions, they must be used at the
same position as the AND instruction. The MEP and MEF instructions cannot be
used at the position of LD or OR instruction.
Constants Others
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