1) When the result of the operation before the MEF instruction is a falling edge (ON → OFF), the instruction will become ON (conducting state); Otherwise, the command will become OFF (non-conductive state). The result is pulsed.

2) The output will be executed once at the moment when the edge signal is turned on, unless a corresponding edge signal is generated again.

Input/Output	Data Type	operand	Description

Instruction table:

NETWORK 000

LD X000

OR X002

MEF // If there is a falling edge in the front contact result, execute the rear output

SET Y000 K1

图1 MEF