577
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
24 Others – FNC181 to FNC189
24.4 FNC188 – CRC / Cyclic Redundancy Check
21
FN
C
160-FN
C
169
R
eal
Ti
m
e
C
loc
k
C
ont
ro
l
22
FN
C
170
-F
N
C
17
9
E
xt
e
rnal
D
evi
ce
23
FN
C
180
Su
b
st.
I
n
str
. I
n
fo
24
FN
C
181-FN
C
189
O
ther
s
25
FN
C
190-FN
C
19
9
B
loc
k D
a
ta
O
per
at
io
n
26
FN
C
200-FN
C
209
C
har
act
e
r St
ring
C
ont
ro
l
27
F
N
C2
10
-F
NC
21
9
Da
ta
O
per
at
ion 3
28
FN
C
220-FN
C
24
9
Da
ta
Co
m
p
a
ris
o
n
29
FN
C
250-FN
C
269
Da
ta
T
a
b
le
O
per
at
io
n
30
FN
C
27
0-F
N
C
274
Ex
-D
ev
ic
e
In
ve
rte
r C
o
mm
s
16-bit conversion mode (while M8161 is OFF)
In this mode, the operation is executed for high-order 8 bits (1 byte) and low-order 8 bits (1 byte) of a device
specified in
.
The operation result is stored to one 16-bit device specified in
.
Example:
= D100
= D0
n =
6
Device
Contents of target data
8 bits
16 bits
Device storing data for
which the CRC value is
generated
Low-order byte
Low-order bits of D100
01H
0301H
High-order byte
High-order bits of D100
03H
+1
Low-order byte
Low-order bits of D101
03H
0203H
High-order byte
High-order bits of D101
02H
+2
Low-order byte
Low-order bits of D102
00H
1400H
High-order byte
High-order bits of D102
14H
...
...
–
+n/2-1
Low-order byte
–
High-order byte
Device storing the
generated CRC value
Low-order byte
Low-order bits of D0
E4H
41E4H
High-order byte
High-order bits of D0
41H
S
D
16-bit conversion mode
FNC188
CRC
n
M8161
M8000
Command
input
D
S
S
D
S
S
S
S
D
Содержание FX3U Series
Страница 1: ...PROGRAMMING MANUAL Basic Applied Instructions Edition FX3U FX3UC SERIES PROGRAMMABLE CONTROLLERS ...
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