Endress+Hauser PROFIBUS Gammapilot M FMG60 Operating Instructions Manual page 40
Radiometric measurement
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Also See for PROFIBUS Gammapilot M FMG60:
- Operating instructions manual (118 pages) ,
- Brief operating instructions (60 pages) ,
- Safety instructions (36 pages)
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Operation
40
IEEE-754 Floating Point Number
The measured value is transmitted as a IEEE 754 floating point number, whereby:
VZ
Measured value = (-1)
x 2
Byte 1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
7
6
5
4
Sign
2
2
2
2
Exponent (E)
Byte 3
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
-8
-9
-10
-11
-12
2
2
2
2
2
Example:
40 F0 00 00 (hex) = 0100 0000 1111 0000 0000 0000 0000 0000 (bin)
0
= (-1)
= 1 x 2
= 1 x 4 x 1.875
= 7.5
Stauts codes
The status codes comprise one byte and have got the following meaning:
Status-
Device status
Code
0C Hex
BAD
0F Hex
BAD
1F Hex
BAD
40 Hex
UNCERTAIN
47 Hex
UNCERTAIN
4B Hex
UNCERTAIN
4F Hex
UNCERTAIN
5C Hex
UNCERTAIN
80 Hex
GOOD
84 Hex
GOOD
89 Hex
GOOD
8A Hex
GOOD
8D Hex
GOOD
8E Hex
GOOD
If a stauts other than "GOOD" is sent to the device, the display indicates an error.
(E-127)
x (1+F)
Bit 2
Bit 1
Bit 0
Bit 7
3
2
1
0
2
2
2
2
Bit 2
Bit 1
Bit 0
Bit 7
-13
-14
-15
-16
2
2
2
2
Mantissa (F)
(129-127)
-1
-2
x 2
x (1 + 2
+ 2
2
x (1 + 0.5 + 0.25 + 0.125)
Significance
device error
device error
out-of-service (target mode)
non-specific
last usable value
(Fail-safe-Mode aktiv)
Substitute set
(fail-Safe mode active)
initial value
(fail-Safe mode active)
Configuration error
(limits not set correctly)
OK
Active block alarm
(static revision counter incremented)
LOW_LIM (alarm active)
HI_LIM (alarm active)
LOW_LOW_LIM (alarm active)
HI_HI_LIM (alarm active)
Gammapilot M FMG 60 - PROFIBUS PA
Byte 2
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
-1
-2
-3
-4
-5
2
2
2
2
2
Mantissa (F)
Byte 4
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
-17
-18
-19
-20
-21
2
2
2
2
2
-3
+ 2
)
Primary value
X
X
X
X
X
X
X
X
X
X
X
X
Bit 1
Bit 0
-6
-7
2
2
Bit 1
Bit 0
-22
-23
2
2
Secondary value
X
X
X
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