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15 - 11
15. ABSOLUTE POSITION DETECTION SYSTEM
(c) Checksum
The checksum is the code which is used by the programmable controller to check for errors in the
received ABS data. The 6-bit checksum is transmitted following the 32-bit ABS data.
At the programmable controller, calculate the sum of the received ABS data using the ladder
program and compare it with the checksum code sent from the servo.
The method of calculating the checksum is shown. Every time the programmable controller
receives 2 bits of ABS data, it adds the data to obtain the sum of the received data. The checksum
is 6-bit data.
Negative data is available for the FX-1PG and unavailable for the A1SD71.
Example: ABS data: 10 (FFFFFFF6H)
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
b
11
101101
b
10
FFFF FFF6
1111 1111 1111 0110
<Appendix>
Decimal
Hexadecimal
Binary
When the binary data of each 2bits of the
ABS data is added up, "10 1101 " is obtained.
b
Therefore, the checksum of " 10" (ABS data) is "2D
b
"
Summary of Contents for MR-J2S-*A
Page 13: ...WWW NNC IR A 12 MEMO ...
Page 117: ...WWW NNC IR 3 70 3 SIGNALS AND WIRING MEMO ...
Page 185: ...WWW NNC IR 7 12 7 GENERAL GAIN ADJUSTMENT MEMO ...
Page 195: ...WWW NNC IR 8 10 8 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 197: ...WWW NNC IR 9 2 9 INSPECTION MEMO ...
Page 221: ...WWW NNC IR 11 10 11 OUTLINE DIMENSION DRAWINGS MEMO ...
Page 293: ...WWW NNC IR 13 64 13 OPTIONS AND AUXILIARY EQUIPMENT MEMO ...
Page 321: ...WWW NNC IR 14 28 14 COMMUNICATION FUNCTIONS MEMO ...
Page 389: ...WWW NNC IR 15 68 15 ABSOLUTE POSITION DETECTION SYSTEM MEMO ...
