Delta DVP-ES2 User Manual download pdf (Page 409)

100

101

3. Instruction Set

3-293

API Mnemonic Operands Function

108

CRC P

CRC checksum

Controllers

ES2/EX2 SS2 SA2

SX2

Bit Devices Word devices Program Steps Type

X Y M S K H KnX KnY KnM KnS T C D E F

n * * *

D *

CRC, CRCP: 7 steps

PULSE 16-bit 32-bit

ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2

Operands:

S: Starting device for RTU mode checksum n: Data length for CRC operation (n = K1~K256) D:

Starting device for storing the operation result

Explanations:

1. n: n must be an even number. If n is out of range, an error will occur and the instruction will not

be executed. At this time, M1067 and M1068 = ON and error code H’0E1A will be recorded in

D1067.

2. 16-bit mode: When CRC instruction operates with M1161 = OFF, hexadecimal data starting

from S is divided into high byte and low byte and the checksum operation is operated on n

number of bytes. After this, operation result will be stored in both hi-byte and low byte of D.

3. 8-bit mode: When CRC instruction operates with M1161 = ON, hexadecimal data starting from

S is divided into high byte (invalid) and low byte and the checksum operation is operated on n

number of low bytes. After this, operation result will be stored in low bytes of D (Consecutive 2

registers).

4. Flag: M1161 8/16-bit mode

1 2 ... 404 405 406 407 408 409 410 411 412 413 414 ... 701 702

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Delta DVP-ES2 User Manual Page 409

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