Delta AH500 Programming Manual page 202

Instruction code
FB_NP
Device DX DY
S
Symbol:
Explanation:
1. When the value in the accumulative register turns from 0 to 1, the instruction FB_NP keeps the
value 1 in the accumulative register for a scan cycle. After the second scan cycle is finished,
the value in the accumulative register changes to 0.
2. The previous state of the contact is stored in the bit device S. Please do not use S repeatedly
in the program. Otherwise, the wrong execution result will appear.
3. The instruction FB_NP only can be used in the function block.
Example:
Instruction:
LD M0
AND M1
FB_NP D0.0
OUT Y0.0
Timing diagram:
M0
M1
One scan cycl e
Y0 .0
Operand
S
X Y M SM
● ● ● ●
S ： For internal use
Operation:
Contact A of M0 is loaded.
Contact A of M1 is connected in series.
The circuit is rising edge-triggered.
The coil Y0.0 is driven.
One scan cycl e
Ch ap te r 5 Bas ic Instruc ti ons
Function
The circuit is rising edge-triggered.
S T C HC
● ● ● ●
Bit
D L PR
● ● ●
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