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The user program can monitor the relay inhibiting status and act accordingly. Also, when the
module's relays are inhibited, any mismatch between the relay position and the output logical
state is ignored.
Module Configuration
Relay Inhibiting for EE Relays
When the dip switch on EE relays is set to 12V DO, the position of the 2-pin
12V DO Control connector on the front panel of the power supply module
(see Power Supply Module chapter above) acts as a safety mechanism.
When the 2-pin TB is unplugged from the 12V DO Control (e.g. for
maintenance), power is not supplied via the motherboard to the relays and
the relays are disabled. The 12V DO affects all relays in the system that are
programmed to work from the 12V DO and not the (default) 12V Main.
EE relays that are programmed for 12V DO operation will disconnect when
12V DO power is shut down and cannot be changed in this state.
ML relays cannot be inhibited.
A dual selector dip switch (S3) on the EE DO Relay module has four selectable positions as
described in the following table:
Table 10-1 DO Relay Module- Dip Switch Settings
S3
SW 1
OFF
ON
OFF
ON
S3
Configuration mode
SW 2
OFF
12V_DO – Relay inhibiting enabled
OFF
Software selectable – inhibiting is set in site configuration
ON
12V_DO – Relay inhibiting enabled
ON
12 V – (factory default) Relay inhibiting disabled
Digital Output Relay 120/230V Module
10-4
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