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A dual selector dip switch (S3) on the DO SBO Relay module has 4 selectable positions as
described in the following tables:
Table 11-1 8 DO SBO Relay Module- Dip Switch Settings
S3
S3
SW 1
SW 2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Table 11-2 16 DO SBO Relay Module- Dip Switch Settings
S3
S3
SW 1
SW 2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
When S3 is set to Software Selectable mode, the inhibiting configuration is set using the
module configuration in the STS Site Configuration (see Table 11-2 above).
Procedure 11-1 describes how to set the 12V DO dip switch to enable/disable relay inhibiting.
Procedure 11-1 How to Set the 12V DO Dip Switch to Enable/Disable Relay Inhibiting.
1) If the 2-pin TB is plugged into the 12V DO Control on the front panel of the power supply
module, unplug it.
2) Remove the DO SBO module from the slot in the rack.
3) Using a sharp tool (such as tweezers, a small screwdriver, or the tip of a ball-point pen),
through the plastic wrap set the S3 dip switch (see Figure 11-3) on the DO SBO module
board to the desired position, according to the legend in Table 11-1 (for 8 DO SBO) and
Table 11-2 (for 16 DO SBO).
Configuration mode
12V – Relay inhibiting disabled
Software selectable – inhibiting is set in site configuration
12V – Relay inhibiting disabled
12V_DO – Relay inhibiting enabled (factory default)
Configuration mode
12V_DO – Relay inhibiting enabled (factory default)
Software selectable – inhibiting is set in site configuration
12V_DO – Relay inhibiting enabled
12V – Relay inhibiting disabled
Figure 11-3 12V DO Dip Switch
11-5
Digital Output SBO Relay Module
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