Delta AS Series Programming Manual page 914

API Instruction code
1807 CRC
Device X Y M
S
n
D
Data
type

S

n

D
Symbol
Explanation
1. This instruction performs a cyclic redundancy check on n bytes starting with the device specified by S. Please refer
to the Additional remark for this instruction (below) for more information about the CRC check code.
2. The operand n must be between 1–1000. If n is not in the range, an operation error occurs, the instruction is not
executed, SM0 and SM1 are ON, and the error code in SR0 is 16#200B.
3. The 16-bit conversion mode: When SM606 is OFF, the instruction divides the hexadecimal data in the device
specified by S into the high 8-bit data and the low 8-bit data. The instruction applies the CRC to every byte, and the
stores the operation result in the high 8-bit and the low 8-bit in the device specified by D. The number of bytes
depends on n.
4. The 8-bit conversion mode: When SM606 is ON, the instruction divides the hexadecimal data in the device
specified by S into the high 8-bit data (invalid data) and the low 8-bit data. The instruction applies the CRC to every
byte, and stores the operation result in the low 8-bit in the two registers. The number of bytes depends on n.
Operand
S, n, D
S T C HC



Pulse instruction
-
S ： First device to which the CRC is applied
n ： Number of bytes
First device in which the operation result is
D ：
stored
Cha p ter 6 App l ied Ins truc tio ns
Cyclic Redundancy Check
D FR SM SR E
 
 

16-bit instruction
AS
Function
K 16# "$" F
 
32-bit instruction
-
6 - 6 3 5
6_