The green OK LED on the front panel indicates correct operation of the unit. This LED extinguishes on
failure as described above. When the OK LED extinguishes shutdown state is indicated. In this state, all
digital outputs turn OFF and the +24V supply turns off.
On processor failure, or on failure during start-up diagnostics, the unit shuts down, and remains in
shutdown until the fault is rectified. The unit also shuts down if the battery voltage falls below 10.8 volts.
This is a protection feature designed to protect the battery from deep discharge in case of extended period
without supply voltage.
Note: During diagnostic testing, it is likely that the module will reset and restart. This will affect the
output signals.
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