GE GFK-1004B user manual Power-Up State, Soft Switch Entry State

6

The Power-Up State

When power is cycled on the Series 90-70 PLC, or whenever the Ethernet Interface is restarted, power-up diagnostics run. Diagnostics running is indicated by the MODULE OK LED blinking fast, while the other LEDs remain OFF. If the Ethernet Interface detects an error in the hardware, it reports this error to the CPU, then shuts down. All LEDs turn OFF if the Ethernet Interface fails a diagnostic test. If this happens, refer to the PLC Fault Table for detailed information.

Note

TheRestart/LoadPushbutton is not operable during the Ethernet

Interface diagnostic phase nor is the Station Manager active. The

Ethernet Interface is in diagnostic phase when the MODULE OK LED is

BLINKING and the ONLINE and STATUS OK LEDs remain OFF.

After diagnostics complete, both the MODULE OK LED and STATUS OK LED blink slowly for 2-3 seconds. (The ONLINE LED is OFF during this time.) This LED sequence identifies the time you may enter the Field Network Test State by entering an ªFº or ªfº at the Station Manager terminal. The table below shows the LED patterns for the power-up diagnostics phase.

Table 6-2. Power-Up State

	Running	Wait for Field	Wait for PLC &	Diagnostic
LED	Diagnostics	Network Test	CPU Handshake
				Failed
	(15 sec)	(2-3 sec)	(to 60 sec)
MODULE OK	Blink	Slow Blink	Slow Blink	OFF
ONLINE	OFF	OFF	OFF	OFF
STATUS OK	OFF	Slow Blink	OFF	OFF

The PLC Fault Table can be especially helpful in detailing faults that are detected in the Power-Up State. In the Power-Up State, the Station Manager is not operational. The Ethernet Interface has likely failed and is far less able to report such failures in detail. See GFK-0265, Logicmaster 90 Programming Software Reference Manual for information on the PLC Fault Table.

Note

If all LEDs go out after completing power-up diagnostics, then power-up diagnostics has failed. Refer to the PLC fault table for more information.

The Soft Switch Entry State

The Soft Switch Entry State is indicated by the MODULE OK LED blinking slowly (every 2 seconds) while the other LEDs remain OFF. The Soft Switch Entry state is automatically entered when the Soft Switch data in the Ethernet Interface is invalid and has not been set up by the Logicmaster 90-70 Configurator. The Soft Switch Entry state is also entered when certain configuration faults that preclude full operation are detected. A limited subset of Station Manager commands is provided in this state. Refer to Chapter 5, ªSoft Switch Entry Utilityº, for further description of the Soft Switch entry state.

GFK-1004B Chapter 6 Troubleshooting 6-5