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Profibus Communication
B.5 Status bytes
The more than 300 parameters including address (Slot and Index), format, value range, start
value and attributes are stored in an object list "Obj80C4.rtf" which will be provided on request.
Note
Acyclic operation with SIMATIC PDM
We recommend using the SIMATIC PDM software package and a PC (compatible with industry
standard) or a programming unit for acyclic operation.
B.4
Input Data (from Slave to Master)
Input data are process data (measured values) which are transmitted from the device to the
master in the following format:
Every measured value consists of 5 bytes which are composed of a floating point value
corresponding with IEEE - 754 (4 bytes) and the correspondent measured value status (1 byte).
In the PROFIBUS telegram, the measured value is transmitted first and then the corresponding
status.
Table B-1
Byte
No.
VZ: sign: 0 positive, 1 negative E: Exponent M: Mantissa
B.5
Status bytes
Status bytes
The status bytes consist of three components:
• Quality (the MSBs 6 and 7):
Describes the basic quality of the corresponding measured value
• Substatus (bits 2 to 5):
Differentiates the quality of the corresponding measured value
• Limits (the LSBs 0 and 1):
Indicate exceeding of the limit value
108
Measured value format
7 (MSB)
6
1
VZ
E
2
7
2
E
M
2
0
2
-1
3
M
M
2
2
-8
-9
4
M
M
2
2
-9
-9
Bit
5
4
3
E
E
E
2
2
2
6
5
4
M
M
M
2
-2
2
-3
2
-4
M
M
M
2
2
2
-10
-11
-12
M
M
M
2
2
2
-9
-9
-9
Operating Instructions, 03/2021, A5E00102775-AC
2
1
0 (LSB)
E
E
E
2
2
2
3
2
1
M
M
M
2
-5
2
-6
2
-7
M
M
M
2
2
2
-13
-14
-15
M
M
M
2
2
2
-9
-9
-9
TRANSMAG 2 with MAG 911/E
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