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INSTALLATION
2.5.1 Standard IOBUS Cable Connections
Standard IOBUS cables, shown in Figure 2-10, are available in several lengths as defined in section 5.3.
Refer to section 6 for the maximum cable length when interconnecting several racks. Each IOBUS cable end
and each IOBUS connector on the Remote I/O Rack are marked with a graphic symbol for identification.
When connecting an IOBUS cable end to a rack, these graphic symbols must match at the connection point.
There are many IOBUS connections possible among the different racks available. Example IOBUS
connections for common Remote I/O Rack arrangements are shown in Figures 2-6, 2-7, and 2-8.
To make IOBUS connections:
1. Use the shortest length cable when racks are mounted in close proximity to one another or within the
same enclosure. When racks are mounted farther apart or in separate enclosures, longer cables are
needed. IOBUS cables to be connected to a Remote I/O Rack connect to the IOBUS connectors located
on the left or right side of the rack's backplane as shown in Figure 2-4 and 2-9.
2. Connect the involved racks as described below:
A) Consult system drawings to identify the type of racks associated with IOBUS, including those
mounted in separate cabinets.
B) If racks are located in separate cabinets, IOBUS cables should already have been routed between
cabinets and tagged. Refer to the following examples:
•
Example A: Connecting a SIXRAC (or MODULRAC) to a Remote I/O Rack:
Connect SIXRAC 1, IOBUS A OUT, J19 to Remote I/O Rack 1, IOBUS A IN, J5
Connect SIXRAC 1, IOBUS B OUT, P24 to Remote I/O Rack 1, IOBUS B IN, P4
•
Example B: Connecting one Remote I/O Rack to another Remote I/O Rack:
Connect Remote I/O Rack1, IOBUS A OUT, J6 to Remote I/O Rack 2, IOBUS A IN, J5
Connect Remote I/O Rack 1, IOBUS B OUT, P5 to Remote I/O Rack 2, IOBUS B IN, P4
C) If more than one rack is mounted in an enclosure; install short IOBUS cables between racks. Tag
each cable end with the rack number and connector destination.
D) If the IOBUS is to be terminated on a Remote I/O Rack or continues on to another rack, refer to
section 2.5.6 for details on orienting the rack's IOBUS shunt.
After completing IOBUS cable connections, do not form a loop by connecting the
last rack to the first rack.
2-10
NOTE
SD39RIO-1
January 2001
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