User guide

Hardware
30
890 USE 108 00 August 2001
LED Indicators The following table lists the LED indicators and their meaning.
LED Indicators Meaning
Ready (amber) Controller has passed power-up diagnostics- LED is ON in unconfigured,
stopped, and run states as long as health status is valid; is OFF when
error condition detected by diagnostics.
Run (green) Controller has started and is solving logic. If memory checksum fails this
light will blink three times for.five seconds followed by a rest period of 2.5
seconds; then the pattern repeats. The controller has detected a STOP
ERROR CODE and may require either restarting, reloading of the user
logic, or reloading of the executive firmware. If the controller attempts to
read the EEPROM card and fails, it terminates the power-up sequence
and flashes the RUN LED on the front panel continually until you cycle
power. Four flashes per second indicates that a checksum error was
detected; one flash per second indicates that the user logic program is
larger than the available memory.
Battery Low (red) Battery needs replacing-14 day hold-up from initial indication
Port 1 (green) Communications are active on Modbus Port 1
Port 2 (green) Communications are active on Modbus Port 2
Note: A green power OK LED exists on the power supply board inside the
controller. It is located below the top surface of the unit. It is visible if the unit is
viewed from the top.