Installing and connecting
2.4 Connecting the field bus to the active field distributors AFD4 / AFD4 (FM) / AFD8
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC
21
Tools required
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Cross-tip screwdriver size 4
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Open ring wrench 20 mm
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Screwdriver with 3 mm blade
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Small knife, diagonal cutter or FC stripping tool
Required accessories
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Bus cable (cable type A)
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Sealing plugs for unused connections (10), 6ES7157-0AG80-1XA1
Stripping dimensions bus cable
For secure connection of the wires in the screw-type terminals, observe the following
stripping dimensions of the bus cables for the main lines and spur lines.
Stripping dimensions
Length of stripping
Main line
T1, T2
Spur lines
S1-S8
Direct grounding
a
90 mm
70 mm
Commissioning plants with active field distributors AFD4 / AFD4 (FM) / AFD8
NOTICE
Bus system failure
If the event of a fault, the bus system may fail completely or partially.
Before you commission a plant with ring redundancy, check the redundancy function by
means of a line interruption/short circuit or by opening the IP30 covers on each AFD4 /
AFD4 (FM) / AFD8 (opening the IP30 covers is also interpreted as a fault).
Extending plants with active field distributors AFD4 / AFD4 (FM) / AFD8
NOTICE
Fault on the main line due to connection of spur lines
If a plant is already in operation, first connect the spur lines to the field devices followed by
the main lines. This sequence reduces interference on the main line.
