User guide

Hardware

890 USE 108 00 August 2001

LED Indicators The following table lists the LED indicators and their meaning.

LED Indicator 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 3 times for.5 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 but 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

Modbus (green) Communications are active on the Modbus port

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, and is visible when the unit

is viewed from the top.