• Route the supply power wires and communication cables at least 50 mm (2 in.) away from the
vent slots in the sides of the network engine housing.
• Provide slack in the wires and cables. Keep cables routed neatly around the network engine to
promote good ventilation, LED visibility, and ease of service.
• Ensure that the building automation network wiring meets the specifications, rules, and
guidelines as outlined in the
Wiring considerations and guidelines for network integrations
section. The network engine does not require an earth ground connection.
• Follow the transformer manufacturer’s instructions and the project installation drawings. Power
supply wire colors may be different on transformers not manufactured by Johnson Controls.
• While connecting network devices to 24 VAC power, make sure that transformer phasing is
uniform across all devices. Powering network devices with uniform 24 VAC supply power phasing
reduces noise, interference, and ground loop problems.
Connecting the FC Bus
To connect devices to the MS/TP Field Controller (FC) Bus, complete the following steps:
1. Connect the 3-wire bus cable to the removable blue 4-pin terminal block labeled
FC-A
as shown
Note:
The FC-A and FC-B terminals can accept either the MS/TP FC Bus or the N2 Bus, but
not a mixture of both on the same trunk. If you want to integrate both the MS/TP Bus and
the N2 Bus, select one FC terminal for MS/TP FC Bus use and the other for N2 Bus use.
Figure 6: FC Bus terminal block and wiring connections
2. To add additional field devices, wire from one device to the next as shown in Figure 7. Do not
connect more than two wires to each terminal to ensure that a daisy chain configuration is
used.
NAE55/NIE55 Installation Guide
10
