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Interfaces to automation systems
8.2 Modbus interface
SITRANS SL
138
Operating Instructions, 12/2010, A5E01132948-04
8.2.3
Quality byte coding
Overview quality byte coding
The Modbus quality byte has the same structure and meaning as the one used for
PROFIBUS.
Structure and meaning of quality byte:
EDG
XQFHUWDLQ
JRRG
JRRGFDVFDGHG
2.
ORZOLPLWHG
KLJKOLPLWHG
FRQVWDQW
06%
4XDOLW\
6XEVWDWXV
/LPLWV
2XWSXWYDOXH
6XEVWDWXVLVDOZD\VVHWWR
,QSXWYDOXH
6XEVWDWXVLVQRWHYDOXDWHG
Figure 8-2
Quality byte coding
Note
Error codes and alarm list
See for explanation and action of error codes and the alarm list chapter Alarm, error, and
system messages (Page 163) .