Status Red/Green LED

The GIO module includes a Status LED mounted on its top surface. This indicates the power and execution state of the board. The interpretation of the red and green LED is described in Table 29-4.

Table 29-4: Interpretation of Red and Green LED
LED State	System Status	Description
Continuously off or on	(1) Logic power off or (2) CPU crashed	Normally indicates that 24VDC logic power is off. In rare instances, indicates that the GIO CPU has crashed due to a system hardware or software error.
Alternating red and green	Board booting	The 24VDC logic power has been turned on and the GIO board is being initialized. NOTE: If this state continues for more than a minute or two, it usually indicates a hardware failure.
Blinking red single	Board operating, waiting for communications.	The GIO CPU has completed it start-up process and is operational. The GIO is waiting for RS-485 communication with the master Guidance Controller to be established.
Blinking red double	Board idle, not communicating	The GIO did not connect to the master controller within 1 minute of boot and is no longer listening to the RS-485. It will not connect until it has been rebooted.
Blinking green	Normal operation, IO active	The GIO is operational and is actively communicating with the master Guidance Controller. The input and output signals on the board are active.