ABB DCS550-S02-0680 680Amp 4 Quadrant DC Drive

ABB DCS550-S02-0680 680Amp 4 Quadrant DC Drive

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In addition to its modification of the function code for an exceptionresponse, the slave places a unique code into the data field of theresponse message. This tells the master what kind of error occurred, orthe reason for the exception.

The master device's application program has the responsibility of han-dling exception responses. Typical processes are to post subsequentretries of the message, to try diagnostic messages to the slave, and tonotify operators.

The data field of messages sent from a master to slave devices con-tains additional information which the slave must use to take the actiondefined by the function code. This can include items like discrete andregister addresses, the quantity of items to be handled, and the countof actual data bytes in the field.

ABB DCS550-S02-0680 Technical drawing:

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