6-9
MSS IDNet wiring, continued
Class B wiring Class B wiring requires the configuration jumpers to be set to positions 1-3 and 2-4. Two
jumpers must be set for each circuit, refer to Figure 6-5 for locations. Each of the four IDNet
outputs provides short circuit isolation between itself and the others. A short on one output is
isolated from the others.
For Class B wiring only, both the B+, B- and A+, A- terminals are available for parallel
connections. A+ is connected to B+, and A- is connected to B- as shown in Figure 6-5.
Additionally, two wires can be connected to each screw terminal. The result is that for Class B
wiring only, four parallel output branch circuits can be connected at the IDNet+ module
terminals.
Figure 6-5. Class B wiring
Note: There are two considerations for addressing Class B wired IDNet devices connected to the IDNet+
module.
1. If no remote isolators or isolator bases are on the loops, device addressing can be assigned without
concern for sequence.
2. If remote isolators or isolator bases are on the loops, the required addressing approach is to start at
the A loop output and assign each successive isolator a higher address than the previous one.
Follow this sequencing through to the B loop, then to the C loop, and then to the D loop.
3. For Class B wiring only, the “A” output and “B” output per loop are connected together in parallel for
wiring convenience.
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