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Function Description
WAGO-I/O-System 750
750-370 PROFINET IO Fieldbus Coupler
Manual
Version 2.0.0
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7.1
Device Start-Up and Initialization
After a restart the fieldbus coupler does several hardware tests, e.g. the check of
memory components.
Successfully passed those tests it initializes the internal communication system K-
Bus to identify the arranged I/O modules and to exchange information with them.
This phase is indicated by the I/O LED, which flashes red at 10 Hz. Subsequent to
the successful K-Bus initialization the I/O-LED changes to green on-state.
The fieldbus coupler then switches to the “Fieldbus Start” state in which it waits
for the connection with the higher-level control system (IO controller) as an IO
device.
If an error occurs during start-up, the I/O LED flashes red and a blink code
indicates the respective error message.
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Figure 37: Fieldbus Coupler Operating System
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More information about the LED Signaling
Read the detailed description for the evaluation of the displayed LED state in the
section “Diagnostics” > … > “LED Signaling”.
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