Toshiba T300MVi - Manual (Page 24)

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8.3 Ethernet/IP Status Indicators
The back side of the interface board contains two bicolor red/green status
LEDs. The lower LED (situated closest to the interface PCB) indicates the
Module Status (MS), and the upper LED indicates the Network Status (NS).
Refer to Figure 4. These LEDs conform to the prescribed behavior as dictated
in the Ethernet/IP specification, Volume 2, Chapter 9.
NS (Network Status)
MS (Module Status)
Interface PCB
Figure 4: Ethernet/IP Status Indicators