GFK-1911B
Chapter 6 Diagnostics
6-11
6
I/O Module LEDs
I/O modules have both diagnostic (
1
) and status (2) LEDs. All input/output module
LEDs are electrically located in the logic area.
Diagnostics LEDs on I/O Modules
The diagnostic indicators (red/green) indicate the status of the modules. A module
is operating normally if its diagnostic LED (D) is on and green. If an error is
detected, the LEDs immediately display the current status.
Green LED
Diagnostics
ON:
Station is active
Flashing:
0.5 Hz: (slow)
Communications power present, backplane not
active
2 Hz:
(medium)
Communications power present, backplane active,
I/O error
4 Hz: (fast)
Communications power present
Backplane communications has failed with the
module or between the module and the preceding
module.
D (1)
OFF:
Communications power not present, backplane not
active
Status LEDs on I/O Modules
The status indicators (yellow) display the status of the relevant inputs/outputs.
Yellow LED
Status of the input/output
ON:
Associated input/output ON
1, 2, 3, 4
(2)
OFF:
Associated input/output OFF
Summary of Contents for VersaPoint IC220PB001
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