GE Industrial Solutions EntelliPro ES - Manual (Page 153)

4.16 EP OS MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: COMMUNICATION
4.1.11 Error Responses
When a EntelliPro ES detects an error other than a CRC error, a response will be sent to the master. The MSBit of the
FUNCTION CODE byte will be set to 1 (i.e. the function code sent from the slave will be equal to the function code sent
from the master plus 128). The following byte will be an exception code indicating the type of error that occurred.
Transmissions received from the master with CRC errors will be ignored by the EntelliPro ES.
The slave response to an error (other than CRC error) will be:
Slave Address: 1 byte
Function Code: 1 byte (with MSbit set to 1)
Exception Code: 1 byte
Crc: 2 bytes
The EntelliPro ES implements the following exception response codes:
01 - Illegal Function The function code transmitted is not one of the functions supported by the EntelliPro ES.
02 - Illegal Data Address The address referenced in the data field transmitted by the master is not an allowable
address for the EntelliPro ES.
03 - Illegal Data Value The value referenced in the data field transmitted by the master is not within range for the
selected data address.