Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 86)

5.2 Relay Circuit Instructions
5.2.8 Falling-edge Pulses (OFF-PLS)
5-17
Instructions
5
5.2.8 Falling-edge Pulses (OFF-PLS)
( 1 ) Operation
The OFF-PLS instruction sets the bit output to 1 (ON) for only one scan when the bit input changes from 1 (ON) to 0
(OFF). The previous value of the bit input is saved in the Previous Value Register of the OFF-PLS instruction.
The following table shows the relationship between the bit input of the OFF-PLS instruction, the Previous Value Reg-
ister, and the bit output.
In the second row of the table, notice how the bit input changes from 1 (ON) in the Previous Value Register to 0 (OFF),
causing the OFF-PLS instruction to set the bit output to 1 (ON).
( 2 ) Format
∗ C and # registers cannot be used.
Œ
The Previous Value Register holds the previous value of the bit input. Do not use other instructions to set the value
of this register.
Bit Input Previous Value Register OFF-PLS Instruction Bit Output
0 (OFF) 0 (OFF) → 0 (OFF)
0 (OFF) 1 (ON) → 1 (ON)
1 (ON) 0 (OFF) → 0 (OFF)
1 (ON) 1 (ON) → 0 (OFF)
Bit input
Bit output
1 (ON)
0 (OFF)
1 (ON)
0 (OFF)
Previous Value
Register
1 (ON)
0 (OFF)
1 scan 1 scan
Parameter Name
Applicable Data Types
B W L F A Index Constant
Previous Value
Register
{ * × × × × × ×
Previous Value Register
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Key entry: ]N