Siemens 7ME305, Operating Instructions Manual, Page: 91 / 124

In the PROFIBUS telegram, the measured value is transmitted first and then the corresponding
status.
Table B-2 Measured value formats
Byte Bit
No. 7 (MSB) 6 5 4 3 2 1 0 (LSB)
1 VZ E
2
7
E
2
6
E
2
5
E
2
4
E
2
3
E
2
2
E
2
1
2 E
2 0
M
2 -1
M
2 -2
M
2 -3
M
2 -4
M
2 -5
M
2 -6
M
2 -7
3 M
2
-8
M
2
-9
M
2
-10
M
2
-11
M
2
-12
M
2
-13
M
2
-14
M
2
-15
4 M
2 -16
M
2 -17
M
2 -18
M
2 -19
M
2 -20
M
2 -21
M
2 -22
M
2 -23
VZ: sign: 0 positive, 1 negative E: Exponent M: Mantissa
B.4 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
Table B-3 Status byte formats
Byte Bit
No. 7 (MSB) 6 5 4 3 2 1 0 (LSB)
5 Quality Substatus Limits
These components may adopt the following values in SITRANS F:
Table B-4 Formats of the quality bits
Bit
7
Bit
6
Profile Designation Meaning
0 0 bad Measured value cannot be used
0 1 uncertain Measured value uncertain
1 0 good (not cascade) Measured value OK
PROFIBUS communication
B.4 Status bytes
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD
91