The Y-link comprises:

• Two IM 153?2 High Feature Outdoor interface modules
• One Y-coupler incl. RS 485 repeater
• One BM IM/IM bus module for two IM 153-2 High Feature Outdoor modules
• One BM Y-coupler bus module

Evaluation of the Y-Link diagnostics (and hence indirectly of the connected DP standard slaves) is supported by driver blocks.

It is recommendable to have a redundant -24 V DC supply for the Y-Link, e.g. with two PS 307/PS 305 load power supplies.