Справочник Пользователя для Mitsubishi Electronics FXCPU
15 Applied Instructions (External Device (optional device))
15.5 CCD / Check Code
403
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Appl
ied
ied
In
stru
cti
cti
ons
(D
ata O
per
at
io
n)
12
Ap
plied
Instru
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ns
Instru
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(High S
peed
Process
ing)
13
App
lied Instr
lied Instr
ucti
ons
(Handy
Instruction)
14
Ap
pl
ied In
struct
struct
ions
(External FX I/O
D
evice)
15
Appl
ied
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Instru
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ons
(External
Dev
ice
ice
(op
tional
dev
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)
tional
dev
ice)
)
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App
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d Instr
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s
s
(E
xter
nal
nal
Devi
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Ap
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ruct
io
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(Dat
a T
ransf
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a T
ransf
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Appl
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In
stru
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(Float
ing P
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t)
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App
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s
s
(D
at
a Oper
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ion 2)
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App
lied Inst
lied Inst
ructi
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ons
(Pos
itioning
Control)
15.5
CCD / Check Code
Outline
This instruction calculates the horizontal parity value or check sum value of error check method used in
communication or the like. The error check method also includes cyclic redundancy check (CRC). Use the
CRC instruction when determining the CRC value.
communication or the like. The error check method also includes cyclic redundancy check (CRC). Use the
CRC instruction when determining the CRC value.
→ As for CRC instruction, refer to section 24.4.
→ As for complementary number [NEG instruction], refer to section 9.10.
1. Format and operation, execution form
2. Set data
3. Applicable devices
S: Refer to "Cautions".
Function and operation explanation
1. 16-bit operation(CCD/CCDP)
The addition data and horizontal parity of the data stored in the device specified by
are calculated, and
the addition data and the horizontal parity are stored in the device specified by
.
In this instruction, the mode usable when calculating includes 16-bit mode and 8-bit mode. As for the
operation of each mode, refer to the following pages.
operation of each mode, refer to the following pages.
FX
3U(C)
FX
3G(C)
FX
3S
FX
2N(C)
FX
1N(C)
FX
1S
FX
U
/FX
2C
FX
0N
FX
0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder/FBD
ST
CCD
16 bits
Continuous
CCD(EN, s, n, d);
CCDP
16 bits
Pulse
CCDP(EN, s, n, d);
Variable
Description
Data type
Input
variable
variable
EN
Execution condition
Bit
Head object device
ANY16
Number of data (n=1 to 256)
ANY16
Output
variable
variable
ENO
Execution state
Bit
Head storage destination device of calculated data (2 points occupied)
ARRAY [0..1]
OF ANY16
OF ANY16
Operand
type
Bit Devices
Word Devices
Others
System User
Digit designation
System User
Special
Unit
Index
Con
stant
Real
Number
Character
String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS T C D
R
U
\G
V Z Modifier K H
E
"
"
P
z
z
z
z z z z
S1
S2
z
z
S1
z z
z
z
z z z z
S1
z
CCD
EN
s
s
ENO
d
n
CCDP
EN
s
ENO
d
n
CCD
EN
s
n
ENO
d
Command input
Head object device
Number of data
Head storage destination
device of calculated data
device of calculated data