Siemens CALOMAT 6 - Cyclical data transmission;measured value status

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
76 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
00ok
0 1 low limited limit value undershot
1 0 high limited limit value exceeded
1 1 constant value constant