3.5 AN↑, AN↓ (Leading and Trailing Contact Instructions)
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Ladder diagram
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Devices that can be specified (indicated by ●)
Operand
Bit device
Specification of bit of
word device
Index modifier
X Y R L T C P E SR IN OT DT.n LD.n
bit ● ● ● ● ● ● ● ● ● ● ● ● ●
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Outline of operation
Type of
instruction
Operation
AN↑
Conduction takes place for 1 scan only following the change of a signal from the OFF to ON state
(rise).
Executes an AND operation with the preceding operation result in serial connection by treating the
input contact as a Form A (normally open) or Form B (normally closed).
AN↓
Conduction takes place for 1 scan only following the change of a signal from the ON to OFF state
(fall).
Executes an AND operation with the preceding operation result in serial connection by treating the
input contact as a Form A (normally open) or Form B (normally closed).
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Operation Example
Program operation of "AN↑" in the ladder diagram
Output to Y110 takes place for 1 scan only following the change of R0 from the OFF to ON
state (rise) when X100 is ON.
3.5 AN↑, AN↓ (Leading and Trailing Contact Instructions)
WUME-FP7CPUPGR-12 3-9
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