Document: LT0439 Vigilant
MX1-Au
Operator Manual
Issue 1.73
23 October 2018
Page 11-27
Figure 11-24
– I-HUB Fibre Ring Wiring
The LM0572 cable should have the 10 way FRC connector cut off, and
the labelled leads wired into the appropriate terminals of the I-HUB.
The OSD139 fibre optic modem is available in both single-mode
(OSD139AFL) and multi-mode (OSD139AF) variants.
Typically, single-mode fibre is suitable for a least 25km and multi-mode
for at least 3km. However specific optical loss budget calculations will
need to have been carried out for the design of the network.
Note: In Figure 11-24 the isolated RS485 ports 1 and 2 are connected to
the I-
HUB’s 0V and 24V. This could violate the earth isolation system
and therefore both the segment on port 1 and the segment on port 2
must use fibre optic cabling. Isolation is still maintained between I-HUBs
via the non-conductive nature of fibre cabling.
If an I-HUB requires both copper and fibre connections contact Johnson
Controls technical support for details.
The I-HUB (FP0771) is usually
mounted on the right hand wall of
the 8U cabinet, or on the right hand
gearplate flange of the 15U cabinet
(see Figure 11-25). Note that you will
have to remove the 15U gearplate
from the cabinet to mount the I-HUB
using four M4 screws.
Optional OSD fibre modems can be
mounted on the
MX1
gearplate in
place of
MX1
Loop Cards by using
the FP1032 OSD139 Fibre Optic
Modem Bracket.
Note: When using fibre cabling you must allow for cable entry and the
minimum bend radius in deciding the cable route to the modems
(commonly 60-90mm for field cables, 40mm for patch leads).
I-HUB
Mounting
Figure 11-25
I-HUB Mounted on right side
Flange