Specifications

Analog Input Modules
31007715 6/2008 43
STB AVI 1255 LED Indicator
Purpose The LEDs on the STB AVI 1255 provide a visual indication of the module’s operating
status.
Location The LED is located on the top front bezel of the module, directly below the model
number:
Indications
RDY Meaning What to Do
off The module is either not receiving logic power or has failed. Check power
flicker* Auto-addressing is in progress.
on The module has achieved all of the following:
z it has power
z it has passed its confidence tests
z it is operational
blink 1** The module is in pre-operational mode.
* flicker—the LED flickers when it is repeatedly on for 50 ms then off for 50 ms.
** blink 1—the LED blinks on for 200 ms then off for 200 ms. This pattern is repeated until
the causal condition changes.
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