Specifications

Analog Input Modules
31007715 6/2008 199
Indications The following table defines the meaning of the two LEDs (where an empty cell
indicates that the pattern on the associated LED doesn’t matter).
RDY ERR Meaning What to Do
off off The module is either not receiving logic
power or has failed.
Check power.
flicker* off Auto-addressing is in progress.
on on The watchdog has timed out. Cycle power; restart the
communications.
on off The module has achieved all of the
following:
z it has power
z it passed its confidence tests
z it is operational
on flicker* An over-voltage error is detected. Check wiring and field device.
flicker* Field power is absent Check power.
A PDM short circuit is detected.
blink 1** The module is in pre-operational mode.
blink 1** A nonfatal error has been detected. Cycle power; restart the
communications.
blink 2*** The island bus is not running. Check network connections;
replace NIM.
* 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.
*** blink 2—The LED blinks on for 200 ms, off for 200 ms, on again for 200 ms then off for
1 s. This pattern is repeated until the causal condition changes.
Note: The detection of error conditions on the PDM input power connection may
be delayed by as much as 15 ms from the event, depending on the sensor bus
load, the system configuration and the nature of the fault.
Field power faults that are local to the input module are reported immediately.
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