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Converting the operation result into a pulse
MEP, MEF
• MEP: This instruction turns ON at the rising edge of the operation result up to the MEP instruction and turns OFF in other
instances.
• MEF: This instruction turns ON at the falling edge of the operation result up to the MEF instruction and turns OFF in other
instances.
Ladder diagram
MEP
MEF
Processing details
■MEP
• This instruction turns ON (conductive state) at the rising edge (OFF to ON) of the operation result up to this instruction. This
instruction turns OFF (non-conductive state) in instances other than the rising edge of the operation result up to this
instruction.
• Use of this instruction makes conversion to pulse easier when multiple contacts are connected in series.
■MEF
• This instruction turns ON (conductive state) at the falling edge (ON to OFF) of the operation result up to this instruction.
This instruction turns OFF (non-conductive state) in instances other than the falling edge of the operation result up to this
instruction.
• Use of this instruction makes conversion to pulse easier when multiple contacts are connected in series.
Operation error
There is no operation error.
• If an indexed contact is converted to pulse by the subroutine program and the FOR to NEXT instructions,
etc., these instructions may not function properly.
• These instructions operate using the operation result so far. Hence, use them at the same position as the
AND instruction. These instructions cannot be used at positions where the LD and OR instructions are
programmed.
Structured text
ENO:=MEP(EN);
ENO:=MEF(EN);
5 SEQUENCE INSTRUCTIONS
107
5.2 Association Instruction
5
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