Delta AH500 Programming Manual page 447

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Instruction code

Explanation:

In communication, the sum check is used to compare checksums on the same data on

different occasions or on different representations of the data in order to verify the data

The 16-bit conversion mode: When SM606 is OFF, the working mode of the instruction is the

16-bit conversion mode. The n pieces of data in the registers starting from the register

specified by S (eight bits as a group) are added up. The sum is stored in the register specified

by D, and the values of the parity bits are stored in D+1.

The 8-bit conversion mode: When SM606 is ON, the working mode of the instruction is the

8-bit conversion mode. The n pieces of data in the registers starting from the register specified

by S (Eight bits forms a group, and only low eight bits are valid.) are added up. The sum is

stored in the register specified by D, and the values of the parity bits are stored in D+1.

The operand n should be within the range between 1 and 256.

When SM606 is OFF, the working mode of the instruction is the 16-bit conversion mode.

When X0.0 is ON, the six pieces of data in D0~D2 (eight bits as a group) are added up. The

sum is stored in D100, and the values of the parity bits are stored in D101.

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

S ： Initial device

Device in which the sum is

n ： Number of pieces of data

Ch a pt er 6 Ap p l i ed I ns t r uc t i ons

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