Error Register For Communication Ffh - ABB PointMaster 200 Series Operating Manual

Communication error register FFH
The communication error registers are used for making error
diagnostics in case of communication problems which occur
when invalid values are transmitted.
The error registers are scanned by the recorder with:
SD3/DA/SA/FC/aa/oo/oo/cc/xx/xx/xx/xx/FCS/ED
|<-- L
Where:
SD3 = A2H
Start byte
DA Target address (bus subscriber address)
SA Source address
FC = 15H
Function code
aa = FFH
Basic address of the parameter field
oooo = 00 00H
2 bytes parameter address (offset)
cc = 09H
Number of scanned data bytes
xx xx
xx xx 4 random bytes
FCS Test byte (Frame Check Sequence)
Sum of the hex value of the L frame without transfor-
mation for FFH
ED = 16H
End byte (End Delimiter), code: 16H
L Number of Bytes in FCS
-->|
The answer of the recorder is:
SD2/LE/LEr/SD2/DA/SA/FC/aa/bb/cc/dd/ee/FCS/ED
Where:
SD2 = 68H
Start byte
LE = 17H
Number of data bytes + 7
LEr Repetition of LE
SD2 = 68H
Repetition of start byte
DA Target address (bus subscriber address B)
SA Source address
FC = 15H
Function code
aa requested data field length
bb Type of error
00H = no error
01H = incorrect basic field address
02H = incorrect offset
03H = incorrect value
04H = incorrect length
05H = Header error
06H = incorrect function code
cc Field address of where error occured
dd Offset at which error occured
ee 4 bytes copy of the incorrect value
FCS Test byte (Frame Check Sequence)
Sum of the hex value of the L frame without transfor-
mation for FFH
ED = 16H
End byte (End Delimiter), code: 16H
L Number of bytes in FCS
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