Indicator Lights - Grundfos IO 403 Installations- Und Bedienungsanleitung

4. Indicator lights

Relay outputs 1 to 4:
The indicator light is yellow when the output is active.
Digital inputs 5 to 8:
The indicator light is yellow when the input is active.
Status (S):
The indicator light is green when the IO 403 module is active
and OK.
The indicator light is red if the IO 403 module does not func-
tion correctly.
Note: The indicator light is red until the program has been
loaded into the CU 401.
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