Chapter 2. Installation
61200142L1-1 Dual Nx56/64 Option Module User Manual 2-5
Power-Up Testing and Initialization
The option module executes a self-test during the power-
up sequence, as described in the TSU/TDU/ESU manual
of the base unit. No initialization input is required. Upon
power-up, any previously configured setting for the op-
tion module is automatically restored unless the software
has changed revision.
When the self-testing is completed and the configuration
is successfully restored, the LED labeled OK in the mod-
ule group on the front panel turns On. For more informa-
tion, see Front Panel Operation in the Operation chapter of
the appropriate TSU/TDU/ESU user manual. If any
alarms are detected during operation, the red LED la-
beled ALARM in the module group on the front panel
turns On.