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12V DO power is shut down and cannot be changed in this state.
ML relays that are programmed for 12V DO operation will freeze in their
current state when 12V DO power is shut down and cannot be changed.
Therefore, setting the dip switch for ML will not necessarily inhibit them.
A dual selector dip switch (S3) on the DO Relay module has 4 selectable positions as
described in the following table:
Table 9-1 DO 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 9-2 below).
Procedure 9-1 describes how to set the 12V DO dip switch to enable relay inhibiting.
Procedure 9-1 How to Set the 12V DO Dip Switch to Enable 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 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 9-3) on the DO module board to
the desired position, according to the legend in Table 9-1.
Note: On older boards, the text on the board may say that OFF/OFF is the factory default.
Ignore this text. The actual factory default on older boards may be OFF/OFF or ON/ON.
The factory default in all newer boards is ON/ON.
4) Replace the DO module in the rack.
5) If the new dip switch position causes DO relay power to be drawn from the 12VDO, plug
the 2-pin TB back into the 12V DO Control on the front panel of the power supply
module.
Configuration mode
12V_DO – Relay inhibiting enabled
Software selectable – inhibiting is set in site configuration
12V_DO – Relay inhibiting enabled
12 V – (factory default) Relay inhibiting disabled
Figure 9-3 12V DO Dip Switch
9-4
Digital Output Relay Module
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