Mitsubishi Electric MELSERVO-J5 User Manual page 304

Ac servo system

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The checksum is the code which is used by the programmable controller to check for errors in the received absolute position

data. The 6-bit checksum is transmitted following the 32-bit absolute value data.

Calculate the sum of the received absolute position data using the sequence program and compare it with the checksum code

sent from the servo.

The following shows how to calculate the checksum. The checksum will add every ABS 2-bit data inputted to the total. The

checksum is 6-bit data.

(Example) Absolute value data: -10 (FFFFFFF6h)

Therefore, the checksum of -10 is "2Dh".

7 ABSOLUTE POSITION DETECTION SYSTEM

7.3 Absolute position detection system by DIO [A]

1111 1111 1111 • • • • • • 0110

The binary addition result is 101101