Delta AH500 Programming Manual page 203

AH5 00 Prog ram m ing M an ua l
Instruction code
FB_PN
Device DX DY
S
Symbol:
Explanation:
1. When the value in the accumulative register turns from 1 to 0, the instruction FB_PN 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_PN only can be used in the function block.
Example:
Instruction:
LD M0
AND M1
FB_PN D0.0
OUT Y0.0
Timing diagram:
M0
M1
Y0 .0
5 - 2 4
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 falling edge-triggered.
The coil Y0.0 is driven.
One scan cycle
Function
The circuit is falling edge-triggered.
S T C HC
● ● ● ●
Bit
One scan cycle
D L PR
● ● ●