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INSTALLATION
2.5.3. IOBUS Cable Connection up to 1500 ft. (460 m)
for Non-Redundant APACS+ Systems Only
This section describes the preparation and installation of IOBUS cables for non-redundant APACS+ systems
when the needed cable length exceeds the maximum standard length of 98.4 ft. (30 m) of factory-prepared
IOBUS cables but is less than 1500 ft. (460 m). This procedure involves splicing of W2040 extension cables
between two remotely located Remote I/O Racks, or between a Remote I/O Rack and another type of rack
(e.g., MODULRAC or SIXRAC).
This section is applicable only to non-redundant APACS+ systems. See section
2.5.4 for non-redundant QUADLOG and rack-to-rack redundant QUADLOG and
APACS+ systems.
The cable preparation procedure provided here involves splicing a custom-length cable that has unprepared
ends. This kind of cable is type W2040. It is intended for use as an IOBUS extension cable between two
Remote I/O Racks, or between another type of rack (e.g., MODULRAC or SIXRAC) and a Remote I/O
Rack.
The Remote I/O Rack can accommodate either prepared or unprepared ends of available IOBUS cable(s). A
prepared cable end has a molded connector on it and is to be plugged into the appropriate IOBUS IN or
IOBUS OUT connector on the rack's backplane (see Figure 2-4). The wires emerging from an unprepared
cable end are to be individually stripped and connected directly to the screw terminals of the associated
IOBUS IN or IOBUS OUT terminal block, also located on the rack's backplane (see Figure 2-4).
When another type of rack (e.g., MODULRAC or SIXRAC) is also used, it requires a prepared cable end
(with a connector) to attach that rack to the IOBUS. In these instances, you must supply DIN rail-mounted
style terminal blocks (one for A side and one for B side). The terminal blocks are needed to transition
between a W2040 unprepared cable end and another cable segment that has a prepared end (usually obtained
by cutting a standard IOBUS cable in half). Each terminal block must be able to accommodate wire sizes of
16 to 28 AWG (1,3 mm
It is important to preserve continuous cable impedance through all splice
connections. This is to minimize signal reflections within the cable and help assure
collision-free communications. After preparing cable ends, make sure each intended
pair is re-twisted at the same intervals all the way to the screw terminals of the
terminal blocks. Refer to Figures 2-15 and 2-16.
2-20
2
2
to 0.09 mm
).
IMPORTANT
IMPORTANT
SD39RIO-1
January 2001
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