Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N050 03003E F or mo re infor ma tio n vi sit:
w w w. e a t o n . c o m
3-73
API Mnemonic Operands Function
25 D DEC P
D
Decrement
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
D * * * * * * * *
DEC, DECP: 3 steps
DDEC, DDECP: 5 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
D
: Destination
Description:
1. If the instruction is not in pulse mode, “1” is subtracted from the value of destination
D
on
every execution of the instruction, which could be every scan.
2. This instruction typically works best using pulse mode (DECP, DDECP).
3. In 16-bit instruction, when –32,768 is reached, “1” is subtracted and it will write a value of
+32,767 to the destination. In 32-bit instruction, when -2,147,483,648 is reached, “1” is
subtracted and it will write a value of +2,147,483,647 to the destination.
4. Flags M1020~M1022 won’t be affected by the operation result of this instruction.
5. If operand
D
uses index register F, then only 16-bit instruction is available.
Program Example:
When X0 = OFF
→
ON, the value in D0 will be decremented by 1.
X0
DECP
D0