214
6 BASIC INSTRUCTIONS
6.2 Arithmetic Operation Instructions
Decrementing 32-bit binary data
DDEC(P)(_U)
These instructions subtract 1 from the device (32-bit binary data) specified by (d).
■Descriptions, ranges, and data types
■Applicable devices
• These instructions decrement contents of device (32-bit binary data) specified by (d) by 1.
• If DDEC(P) instruction is executed when contents of device specified by (d) is 0, -1 is stored in the device specified by (d).
(If signed is specified)
• If DDEC(P)_U instruction is executed when contents of device specified by (d) is 0, 4294967295 is stored in the device
specified by (d). (If unsigned is specified)
• Flags (zero, carry and borrow) are not activated at this time.
Note that data is decremented in every operation cycle in a continuous operation type (DDEC) instruction.
There is no operation error.
Ladder diagram Structured text
ENO:=DDEC(EN,d);
ENO:=DDECP(EN,d);
ENO:=DDEC_U(EN,d);
ENO:=DDECP_U(EN,d);
Operand Description Range Data type Data type (label)
(d) DDEC(P) Head device to be decremented by 1 -2147483648 to +2147483647 32-bit signed binary ANY32_S
DDEC(P)_U 0 to 4294967295 32-bit unsigned binary ANY32_U
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(d)
73500 (BIN) 73499 (BIN)
-1
b0
(d)
··· ···
(d)+1
(d)
(d)+1
b31 b16 b15
b0
··· ···
b31 b16 b15
To Next Page
Loading...
Need help?
General
