85
13 Supplement
FIBERTRAC 31 • Profibus PA
43833-EN-170126
Data format of the output signal
Byte4
Byte3
Byte2
Byte1 Byte0
Status
Value (IEEE-754)
Fig. 29: Data format of the output signal
The status byte corresponds to profile 3.02 "Profibus PA Profile for Process Control Devices" coded.
The status "Measured value OK" is coded as 80 (hex) (Bit7 = 1, Bit6 … 0 = 0).
The measured value is transferred as a 32 bit floating point number in the IEEE-754 format.
Byte n
Byte n+1
Bit
7
VZ
Exponent
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Sign
Bit
Significant
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Byte n+2
Byte n+3
Bit
7
2
Significant
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Significant
-9
-10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23
-8
Value = (-1)
VZ
2
(Exponent - 127)
(1 + Significant)
Fig. 30: Data format of the measured value
Coding of the status byte associated with the PA output value
You can find further information for the coding of the status byte in the Device Description 3.02 on
www.profibus.com
.
Status code
Description according to
Profibus standard
Fault description
0 x 24
bad
(F) Failure
0 x 3C
bad
(C) Function Check
0 x 78
uncertain
(S) Out of Spec
0 x A4
good
(M) Maintenance required
0 x A8
good
(M) Maintenance demanded
0 x 00
good
(G) Good
Mapping - User error codes
Priority
Description according to
Profibus standard
User Error Codes
NE-107 status
31
Hardware Failure
40, 41
FAILURE
30
Memory Failure
34, 35, 36, 37
FAILURE
29
Software Failure
80
FAILURE
28
Parameterization corrupt
72
FAILURE
27
Undefined 27
-
-
26
Undefined 26
-
-
25
Parameterization Error
16, 17, 25, 52, 53, 57, 66,
117, 120
FAILURE
24
Conflict in MGC
121, 122, 141
FAILURE
