Siemens SIMATIC TIWAY 1 - Manual (Page 175)

ERROR CODES AND DIAGNOSTICS
UNILINK HOST ADAPTER 6–12
USER MANUAL
6.4.3 LED Error Codes
Figure 6–4 shows the pattern that can be displayed on the LEDs when you run
any of the diagnostic tests. If an error does occur, the Adapter Good LED will
flash two times each second and one of the error codes shown below will be
displayed. The external loopback tests will only be performed when Position 10
of Dipswitch 2 is up.
LED Error Codes
No Error (Diagnostic Mode)
Diagnostics ROM Checksum Error
RAM Test Error
TIWAY I Port 1 External
Looopback Error
TIWAY I Port 2 External
Loopback Error
Host Port (Port 3) Loopback Error
Port 4 Loopback Error
TIWAY I Serial Communications
Controller Failure
PIM Checksum Error
CPU Failure
–5 volt Power Supply Failure
Watchdog Timer Failure
I/O Loopback Error
Network Address Error
ROM Checksum Error
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Legend: –Flashing –On (Lit) –Off (Extinguished)
No Error (Run Mode) ............................
1 2 3 4 5 6
External
Figure 6–4 LED Error Codes