3.6 OR↑, OR↓ (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
OR↑
Conduction takes place for 1 scan only following the change of a signal from the OFF to ON state
(rise).
Executes an OR operation with the preceding operation result in parallel connection by treating
the input contact as a Form A (normally open) or Form B (normally closed).
OR↓
Conduction takes place for 1 scan only following the change of a signal from the ON to OFF state
(fall).
Executes an OR operation with the preceding operation result in parallel 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 "OR↑" in the ladder diagram
Output to Y110 takes place for 1 scan only following the change of X100 or R0 from the ON to
OFF state (fall).
1 scan
X100
R0
Y110
1 scan
1 scan
3.6 OR↑, OR↓ (Leading and Trailing Contact Instructions)
3-10 WUME-FP7CPUPGR-12
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