Proline Promag 53 FOUNDATION Fieldbus
32 Endress+Hauser
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The permissible ambient temperature may be considered either individually for each
device at the respective place of installation, or specified uniformly for the bus segment
as a whole. In the latter case the lowest value of the ambient temperature applies.
In the next step is the verification of whether the installed bus components fulfil the
conditions and limit values set in the FISCO model. This is simplified by ensuring the
bus components correspond to the FISCO model. A detailed consideration of the
safety-relevant nominal values is then not necessary.
The following conditions have been applied to the bus cable and network structure:
Bus cable:
Network structure:
Final consideration:
For the example shown, intrinsic safety according to the FISCO model can be proven.
Required temperature class Intrinsically safe equipment Maximum ambient temperature
T6
Cerabar S 40 °C
Promag 53 50 °C
(at 80 °C medium temperature)
Do bus components correspond to the
FISCO model?
Condition met?
Power Repeater KLD2-PR-Ex1.IEC1 ✓ Yes
Promag 53 ✓ Yes
Cerabar S ✓ Yes
Fieldbus connection KMD0-FT-Ex ✓ Yes
Values Condition Limits acc. FISCO model Condition met?
R’ >
<
15 Ω/km
150 Ω/km
C’ >
<
80 nF/km
200 nF/km
L’ >
<
400 µH/km
1000 µH/km
Bus cable type A
R’ = 24 Ω/km
C’ = 82 nF/km
L’ = 623 µH/km
✓ Yes
Consideration Condition Limits acc. FISCO model Condition met?
Cable length including drop
cables
≤ 1000 m
L
SEG
= 660 m ≤ 1000 m ✓ Yes
Drop cable length ≤ 30 m ✓ Yes
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