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6
6-5
GFK-1004B
Chapter 6 Troubleshooting
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
The Restart/Load Pushbutton 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 “F” or “f”
at the Station Manager terminal. The table below shows the LED patterns for the
power-up diagnostics phase.
Table 6-2. Power-Up State
LED
Running
Diagnostics
(15 sec)
Wait for Field
Network Test
(2-3 sec)
Wait for PLC &
CPU Handshake
(to 60 sec)
Diagnostic
Failed
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, “Soft Switch Entry
Utility”, for further description of the Soft Switch entry state.