3. Hang the network engine by the DIN rail hooks (Figure 3) on the top track of the DIN rail, and
position the network engine DIN rail channel snugly against the tracks of the DIN rail.
4. Push the bottom mounting clips up to secure the network engine on the DIN rail tracks.
To remove the network engine from the DIN rail, snap the bottom DIN clips to the outward
extended position, and carefully lift the network engine off the DIN rail.
Enclosure mount applications
Mount the enclosure per the manufacturer’s instructions and mount the network engine in the
enclosure following the guidelines in the
sections.
Wiring
Power supply, network, and bus connections
See Figure 1 for the location of network engine ports, modular jacks, and terminal blocks.
Power supply
In North America, the network engine requires a dedicated Class 2, 24 VAC, 25 VA minimum power
supply. Outside North America, use a 24 VAC SELV transformer at the appropriate rating. The
minimum input voltage for the network engine to operate properly is 20 VAC. Maximum power
consumption is 25 VA.
FC Bus port
MS-NAE351x-x
and
MS-NAE451x-x
models support one N2 Bus trunk or one MS/TP Bus trunk on
the FC Bus port. Connect either an N2 Bus trunk or an MS/TP Bus trunk to the 4-wire terminal block
plug labeled
FC BUS
.
The Field Controller (FC) Bus connection on an NAE35 and NAE45 is a 4-pin removable, keyed
terminal block labeled
FC BUS
. The FC bus connection is an optically isolated RS-485 port with a
keyed 4-position terminal block that communicates at 9.6k, 19.2k, 38.4k, or 76.8k baud. Use an FC
Bus port to integrate an N2 network, BACnet MS/TP FC Bus trunk, or third-party network into the
Metasys
system.
Note:
N2, BACnet MS/TP, Modbus RTU, and M-Bus have different protocols and network
requirements. Do not intermix N2, MS/TP, Modbus, or M-Bus devices on the same FC Bus port.
The SHD connection on the FC terminal block is not connected to any earth ground connection. See
Table 2 and Table 3 for more information on bus rules and bus device limits.
FC Bus modular jack
The 6-pin modular jack labeled
FC BUS
is an FC Bus service port for MS/TP applications (only).
Note:
Do
not
connect an N2 trunk to the 6-pin modular FC Bus jack.
Refer to the
N2 Communications Bus Technical Bulletin (LIT-636018)
or the
MS/TP Communications Bus
Technical Bulletin (LIT-12011034)
for additional information and guidelines on wiring devices on an
N2 trunk or an MS/TP trunk.
LON network terminal block
The blue, keyed, removable, 3-position LON terminal block connects a LonWorks
®
network trunk
to network engine models that support a LonWorks network trunk. The Shield (SHD) on the LON
terminal block is soft grounded to the network engine chassis terminal, and you can use it as a
convenient terminal to connect cable shield drains in daisy-chain bus applications that use shielded
cable.
5
NAE35/NAE45 Installation Guide
