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DVP-ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming
3-258
API Mnemonic Operands Function
91
LDF
Falling–edge detection operation
Controllers
ES2/EX2 SS2 SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S * * * * * *
LDF: 3 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
Operands:
S: device to be falling pulse triggered
Explanations:
LDF should be connected to the left side bus line. When the associated device S is driven from ON
to OFF, LDF will be ON for one scan cycle.
Program Example:
Ladder Diagram:
X0 X1
Y1
Instruction Code: Operation:
LDF X0 ; Load falling-edge contact X0
AND X1 ; Connect NO contact X1 in series.
OUT Y1 ; Drive Y1 coil