INSTALLATION SD39RIO-1
January 2001
2-36
IMPORTANT
When the Remote I/O Rack is to be used as an extension of another rack, such as
SIXRAC, both the Remote I/O Rack and the other rack must have the same Rack
Address switch setting. In addition, the Remote I/O Rack’s Slot Address range switch
(SW2) must be set in the 7-10 position. If SW2 is set incorrectly, it may cause
IOBUS communications anomalies and prevent the process from going on-line.
The Slot Address switch must be set when the Remote I/O Rack is off-line and powered-down. The Slot
Address switch is to be set in conjunction with the Rack Address switch described in section 2.6.
To set the Slot Address switch:
1. Locate the Slot Address switch (SW2) on the backplane (Figure 2-25). It is a two-position slide switch.
2. Consult system drawings to identify the slot address range (1-4 or 7-10) of the Remote I/O Rack.
3. Set SW2 to the 1-4 or 7-10 (default) slot address position as needed.
2.8 Recirculating Fan Power Cable Connection
The Remote I/O Rack has two built-in 24 Vdc recirculating fans located under the module housing area of its
chassis. A bottom view of the chassis is shown in Figure 2-26. A fan power cable exits the right side of the
chassis. It has an unterminated end with three stripped wires for connection to a 24 Vdc power source. The
wiring color code is as follows:
• Red (+)
• Black (-)
• Green (Ground)
Connect the fan’s power cable to a 24 Vdc power source. It is recommended that the fan’s 24 Vdc power
source be separate from the 24 Vdc power source(s) used to power the rack’s I/O modules to keep electrical
motor noise away from the rack’s backplane.
WARNING
Electrical shock hazard. Remove power from all involved wires and terminals before
making connections.
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