W&T 57630 Manual page 193

W&T
All LEDs are turned on for approx. 2 sec.
This function can be used to uniquely identify a Web-IO in the
control cabinet.
i
The actual state of the outputs is thereby not changed.
The 3 LEDs for the Ethernet connection are not affected
by this test.
Subject to errors and modifications:
Diacnostics and testing
193