Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 252)

6 Application Instructions API 00-49
DVP-PLC Application Manual 6-40
API Mnemonic Operands Function
25 D DEC P Decrement
Controllers
ES/EX/SS SA/SX/SC EH/SV
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
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
D : Destination device
Explanations:
1. If D is used in device F, only 16-bit instruction is applicable.
2. See the specifications of each model for their range of use.
3. If the instruction is not a pulse execution one, the content in the designated device D will minus “1” in every scan
period whenever the instruction is executed.
4. This instruction adopts pulse execution instructions (DECP, DDECP).
5. In 16-bit operation, -32,768 minuses 1 and obtains 32,767. In 32-bit operation, -2,147,483,648 minuses 1 and
obtains 2,147,483,647.
6. The operation results will not affect M1020 ~ M1022.
Program Example:
When X0 = Off→On, the content in D0 minuses 1 automatically.
X0
DECP D0