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To connect addressable devices/detectors to the SPS IDNet using Class B wiring, read the
following instructions.
1. Under AS1670.1 Class B wiring is allowed only for a maximum of 40
addressable devices.
2. A ferrite bead is required on the SPS IDNet cable.
3. On TB1, jumper B+ to A+, and jumper B- to A-.
4. Route wire from the B+, B- terminals to the devices.
The illustration below shows Class B wiring.
B+ B- SHLD
IDNet
A+
P1
3
2
1
A-
IDNet LINES TO DEVICES
(CLASS B / STYLE 4)
Figure 5-10. Class B (string) Wiring
SPS IDNet Wiring, Continued
Class B (string)
Wiring
Ferrite bead
required.