2-8. Diagnostic LEDs
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U3-1021
Westinghouse Proprietary Class 2C
2-8. Diagnostic LEDs
The Link Controller has 12 LEDs on the Personality module. These LEDs are used
to show the status of the module and how it is communicating to the Controller.
Table 2-9. Link Controller Module Diagnostic LEDs
LED
Description
P (Green)
Power OK LED. Lit when the +5V power is OK
C (Green)
Communications OK LED. Lit when the Controller is communicating with
the Serial Link Controller module.
E (Red)
External Fault LED. Lit when the Electronic module’s 80C186EC CPU
sets bit 1 of the internal Electronics module Board Control register.
I (Red)
Internal Fault LED. Lit whenever the Force Error bit (Bit 1) of the
Configuration Register is active or when a timeout of the I/O bus watchdog
timer occurs when the Controller stops communicating with the module.
The Electronic module’s 80C186EC processor may also set bit 0 of the
internal Electronic module’s Board Control register that forces the Internal
Fault LED to illuminate.
Also lit following module power-up until the Electronic module’s
80C186EC processor resets internal Electronic module’s Board Control
register bit 0.
1 through 8 (Green)
Status LED. Lit when the Electronic module’s 80C186EC processor sets
the corresponding bit in the internal Electronic module’s LED status.
