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7 BASIC INSTRUCTIONS
7.2 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).
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
Processing details
• 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.
Precautions
Note that data is decremented in every operation cycle in a continuous operation type (DDEC) instruction.
Operation error
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);
FBD/LD
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
EN
Execution condition
Bit
BOOL
ENO
Execution result
Bit
BOOL
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
X, Y, M, L, SM,
F, B, SB, S
T, ST, C, D, W,
SD, SW, R
U
\G
Z
LC
LZ
K, H
E
$
(d)
(d)
EN
ENO
d
73500 (BIN)
73499 (BIN)
-1
b0
(d)
···
···
(d)+1
(d)
(d)+1
b31
b16 b15
b0
···
···
b31
b16 b15
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 17: ...15 CONTENTS ...
Page 24: ...22 MEMO ...
Page 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
Page 1107: ...I 1105 MEMO ...
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