ABB 1SAZ411201R1001 Thermal Overload Relay

ABB 1SAZ411201R1001 Thermal Overload Relay

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During generation of the CRC, each 8-bit character is exclusive ORedwith the register contents. Then the result is shifted in the direction ofthe least significant bit (LSB), with a zero filled into the most significantbit (MSB) position. The LSB is extracted and examined. 

If the LSB wasa 1, the register is then exclusive ORed with a preset, fixed value. If theLSB was a 0, no exclusive OR takes place.This process is repeated until eight shifts have been performed. Afterthe last (eighth) shift, the next 8-bit byte is exclusive ORed with the reg-ister's current value, and the process repeats for eight more shifts asdescribed above. The final contents of the register, after all the bytes ofthe message have been applied, is the CRC value.In ladder logic, the CKSM function calculates a CRC from the messagecontents. For applications using host computers, a detailed example ofCRC generation is contained later in this appendix.

ABB 1SAZ411201R1001 Technical drawing:

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