Mitsubishi Electric MR-J5 Series, Руководство пользователя

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7 ABSOLUTE POSITION DETECTION SYSTEM
7.3 Absolute position detection system by DIO [A]
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• Checksum
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".
1111 1111 1111 • • • • • • 0110
-10
FFFF FFF6
10
b
01
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
11
b
101101
b
+
<Supplement>
Decimal
Hexadecimal
Binary
The binary addition result is 101101b.