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