User guide

Hardware
890 USE 108 00 August 2001 35
LED Indicators The following table shows LED Indicators on the E984-258 Controllers.
Indicator Meaning
ready (yellow) Controller has passed power-up diagnostics- LED is ON in
unconfigured, stopped, and start states as long as health status is
valid; is OFF when error condition detected by diagnostics.
run (yellow) Controller has started and is solving logic. (See LED Error Codes,
p. 211) for the RUN LED error codes
battery low (red) Battery needs replacing-10 day hold-up from initial indication (258C
has no battery)
Modbus 1 (yellow) Communications are active on the Modbus port 1
Modbus 2 (yellow) Communications are active on the Modbus port 2
Note: The E984-258C meets Railway standard EN 50 155 because it has yellow
LEDs, extended operating temperature, conformal coating and can operate with no
battery in addition to other requirements. Since no battery comes with the 258C,
the Battery Low LED is always ON. You may purchase and install a battery based
upon your needs. Simply replace the battery dummy (part number AS-BDUM-001)
with a battery and the Battery Low LED turns OFF.
CAUTION
No battery.
When NO battery is present you MUST save your ladder logic
(application) to internal FLASH before power is cycled. If you do not
save it to FLASH, your ladder logic (application) will be lost.
Failure to observe this precaution can result in injury or
equipment damage.