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24 Applied Instructions (Others)
24.4 CRC / Cyclic Redundancy Check
595
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
21
Applied Instructions
(Real Time
Clock Control)
22
Applied Instructions
(External Device)
23
Applied Instructions
(Extension
Function)
24
Applied Instructions
(Others)
25
Applied Instructions
(Block Data
Operation)
26
Applied Instructions
(Character
String Control)
27
Applied Instructions
(Data Operation 3)
28
Applied Instructions
(Data Comparison)
29
Applied Instructions
(Data Table
Operation)
30
Applied Instructions
(External Device
Communication)
Error
An operation error is caused in the following cases. The error flag M8067 turns ON, and the error code is
stored in D8067.
1) When any digits other than 4 digits are specified as the devices specified as or in digit
specification of bit device (error code: K6706)
2) When n is outside the allowable range (1 to 256) (error code: K6706)
3) When a device specified by +n-1 or +1 is outside the allowable range (error code: K6706)
Program examples
In the program example shown below, the CRC value of the ASCII code "0123456" stored in D100 to D106 is
generated and stored to D0 when M0 turns ON.
1. In the case of 16-bit mode
2. In the case of 8-bit mode
Contents of data
Target data
Device storing data for which the
CRC value is generated
D100 3130H
Low-order byte 30H
High-order byte 31H
D101 3332H
Low-order byte 32H
High-order byte 33H
D102 3534H
Low-order byte 34H
High-order byte 35H
D103 3736H
Low-order byte 36H
--
Device storing the generated
CRC value
D0 2ACFH
Low-order byte CFH
High-order byte 2AH
Contents of target data
Device storing data for which the
CRC value is generated
D100 Low-order byte 30H
D101 Low-order byte 31H
D102 Low-order byte 32H
D103 Low-order byte 33H
D104 Low-order byte 34H
D105 Low-order byte 35H
D106 Low-order byte 36H
Device storing the generated CRC
value
D0 Low-order byte CFH
D1 Low-order byte 2AH
[Structured ladder/FBD] [ST]
M8161:=NOT M8000;
CRC(LDP(TRUE,M0),D100,K7,D0);
M8161
M8000
16-bit
conversion mode
CRC
EN ENO
d
D0D100 s
K7
n
LDP
EN ENO
d
s
M0
[ST]
M8161:=M8000;
LDP(TRUE,M0);
CRC(TRUE,D100,K7,D0);
[Structured ladder/FBD]
8-bit
conversion mode
M8161
M8000
CRC
EN ENO
d
D0D100 s
K7
n
LDP
EN ENO
d
s
M0