Siemens ULTRAMAT 6 Manual page 94

3.1.3 Cyclical data transmission/measured value status
The following user data can be exchanged cyclically using the PROFIBUS:
Parameter name Meaning
OUT
DS 33 data type:
See PROFIBUS-PA Profile for Process Control Devices / General Requirements for a detailed
description
Meaning of Status
A status byte is transmitted synchronously in addition to each of the measured values in the DS-33 data
structure. This byte provides indication of the quality for this value in a "quality code".
The status byte has the following structure:
See PROFIBUS-PA Profile for Process Control Devices / General Requirements for a detailed description
MSB
7 6 5
Quality
0 0
0 1
1 0
1 1
The substatus has a different
quality depending on the
coding
ULTRAMAT 6 / OXYMAT 6 / CALOMAT 6 / ULTRAMAT 23 / OXYMAT 61
Schnittstelle PROFIBUS DP / PA Interface
A5E00054148-03
Measured value and
status
Byte 1 Byte 2
Analog value in IEEE floating point
Exponent
MSB
4 3 2
Substatus
Direction seen from
gas analyzer
Output
Byte 3 Byte 4
Fraction
1 0
Limits
bad
uncertain
good
good (cascaded)
0 0 ok
0 1 low limited
1 0 high limited
1 1 constant
Data type Length in
bytes
DS-33 5
Byte 5
Status
bad
uncertain
good
good (cascaded)
limit value undershot
limit value exceeded
value constant
94