ABB AC 800M

Section 3 Fieldbus Topologies MBP and intrinsically safe installation
3BDS009029R5001 B 75
MBP and intrinsically safe installation
In the past, it was necessary to create time-consuming intrinsic safety audit trails in
order to obtain permission to operate plants in Ex (Haz.) areas. Now, thanks to the
use of the FISCO model (Fieldbus Intrinsically Safe Concept), you can easily design
and operate your PROFIBUS PA system in Ex (Haz.) areas in no time at all.
Requirements are:
• Devices certified acc. to FISCO (EC type attestation of conformity)
• U, I and P acc. to EN 50 020
• Cable parameters observed (R, L, C)
• Bus termination existing and correct
• Total length of the PA segment, incl. spurs, to be kept
– when using passive T-junction <
1000 m
– when using Multi Barrier <
1900 m
A system certification is no longer required for a PA segment in the Ex (Haz.) area!
When using passive T-junction in the Ex (Haz.) area acc. FISCO up to 8 PA devices
per segment are placeable, by using Multi Barrier up to 32 PA devices. The
PROFIBUS DP/PA Linking Devices LD 800P corresponds to the FISCO Model.