Delta AH500 Programming Manual page 581

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Instruction code

Explanation:

Please refer to the additional remark on the instruction CRC for more information about the

CRC check code.

The operand n should be within the range between 1 and 1000. If n is not within the range, the

operation error occurs, the instruction is not executed, SM0 and SM1 are ON, and the error

code in SR0 is 16#200B.

The 16-bit conversion mode: When SM606 is OFF, the hexadecimal data in the device

specified by S is divided into the high 8-bit data and the low 8-bit data. The CRC is applied to

every byte, and the operation result is stored in the high 8-bit and the low 8-bit in the device

specified by D. The number of bytes depends on n.

The 8-bit conversion mode: When SM606 is ON, the hexadecimal data in the device specified

by S is divided into the high 8-bit data (invalid data) and the low 8-bit data. The CRC is applied

to every byte, and the operation result is stored in the low 8-bit in the two registers. The

number of bytes depends on n.

The PLC is connected to the VFD-S series AC motor drive (RTU mode: SM210 is ON; 16-bit

mode: SM606 is ON.). The value 16#12, which will be written into the device at 16#2000 in the

VFD-S series AC motor drive, is written into the device in the PLC first.

The PLC sends 01 06 2000 0012 02 07.

Pulse instruction 16-bit instruction (7 steps) 32-bit instruction

S ： Initial device to which the CRC is applied

n ： Number of bytes

D ： Initial device in which the operation result is stored

C ha pt er 6 A p pl i e d In s tr uc t io n

Cyclic Redundancy Check

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