INM 937x-FB2-Px-SS Rev 1
10
Figure 4 .3
– Trunk Terminal Area connector details
Trunk cables pass through the enclosure wall via cable glands into the Trunk Terminal
Area.
Terminals are provided to allow a variety of wiring arrangements, according to the
particular requirements of the installation.
– “Trunk In” cable only
– “Trunk In” and “Trunk Out” cables
– Active and spare “Trunk In” cables
– Active and spare “Trunk In” cables with overall cable shield
– Active and spare “Trunk In” cables and “Trunk Out” cable
Figures 4.4 and 4.5 provide more details on the cable wiring options.
CAUTION!
THE ‘+’ AND ‘–’ WIRES OF A ‘SPARE’ TRUNK IN CABLE MUST BE CONNECTED
ONLY TO TERMINALS MARKED ‘NC’. THIS ENSURES THAT THE SPARE CABLE
IS NOT ELECTRICALLY CONNECTED IN PARALLEL WITH THE ‘ACTIVE’ TRUNK IN
OR TRUNK OUT CABLES. THE CABLE SHIELD OF THE SPARE CABLE SHOULD BE
CONNECTED TO AN ‘S’ TERMINAL.
ALL ‘SPARE’ TRUNK-IN CONNECTIONS (‘+’, ‘–’ AND SHIELD) MUST BE FIRMLY
GROUNDED AT THE HOST.
Local
ground
connection
Trunk (-)
terminals
Grounding
link
terminals
Trunk screen
terminals
Trunk (+)
terminals
F93-XE
Fieldbus
terminator
Overall
shield
Spare
Active
Trunk in
NC 1+
1S 2S 3S
2+
1– 2– NC
Trunk in
Figures 4 .4
- ‘Trunk In’ with Active & Spare
cable pair and overall cable shield
NC 1+
1S 2S 3S
2+
1– 2– NC
Spare
Active
Trunk in Trunk out
Trunk in Trunk out
Figures 4 .5
- Active & Spare ‘Trunk In’
cables plus ‘Trunk Out’ cable
Image to be updated
