Mitsubishi Electric FX3G SERIES Programming Manual page 596

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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 S .
The operation result is stored to one 16-bit device specified in
M8000
Command
input
FNC188
CRC
Device storing data for which
the CRC value is generated
Device storing the generated
CRC value
8-bit conversion mode (while M8161 is ON)
In this mode, the operation is executed only for low-order 8 bits (low-order 1 byte) of a device specified by
With regard to the operation result, low-order 8 bits (1 byte) are stored to a device specified by
8 bits (1 byte) are stored to a device specified by
M8000
Command
input
FNC188
CRC
Device storing data for
which the CRC value is
generated
Device storing the
generated CRC value
594
M8161
16-bit conversion mode
n
S
D
Low-order byte
S
High-order byte
Low-order byte
S +1
High-order byte
Low-order byte
S
+2
High-order byte
Low-order byte
S
+n/2-1
High-order byte
Low-order byte
D
High-order byte
D
M8161
8-bit conversion mode
n
S
D
Low-order byte
S
Low-order byte
S
+1
Low-order byte
S
+2
Low-order byte
S +3
Low-order byte
S +4
Low-order byte
S
+5
Low-order byte
S
+n-1
Low-order byte
D
Low-order byte
D +1
24.4 FNC188 – CRC / Cyclic Redundancy Check
D .
Example:
Device
Low-order bits of D100
High-order bits of D100
Low-order bits of D101
High-order bits of D101
Low-order bits of D102
High-order bits of D102
Low-order bits of D0
High-order bits of D0
+1.
Example:
Device
Low-order bits of D100
Low-order bits of D101
Low-order bits of D102
Low-order bits of D103
Low-order bits of D104
Low-order bits of D105
Low-order bits of D0
Low-order bits of D1
24 Others – FNC181 to FNC189
S
= D100
D
= D0
n = 6
Contents of target data
8 bits 16 bits
01H
0301H
03H
03H
0203H
02H
00H
1400H
14H
–
–
E4H
41E4H
41H
S
D , and high-order
S = D100
D
= D0
n = 6
Contents of target data
01H
03H
03H
02H
00H
14H
–
–
E4H
41H
.