ICT PRT-PSU-DIN-2A, Installation Manual, Page: 18 / 50

If any of these currents are exceeded, a separate power supply must be used, as shown below.
Shielded Cable
Network Module
Shielded Cable
Module Network
NA N+ N- NB NA N+ N- NB NA N+ N- NB
V+
V-
Power Supply 1
Controller
NA N+ N- NB
Power Supply 2
V+
V-
The 12V N+ and N- communication input must be supplied from only one point. Connections from more than
one 12V supply may cause failure or damage to the unit or the device supplying network power.
Module Wiring
The recommended module network wiring specifications are:
⦁ Belden 9842 or equivalent
⦁
24AWG twisted pair with characteristic impedance of 120 ohm
⦁ Maximum total length of cable is 900m (3000ft)
⦁
CAT5e / CAT6 are also supported for data transmission when using ground in the same cable (to a
maximum length of 100m (328ft))
Warning: Unused wires in the cable must not be used to carry power to other devices.
End of Line (EOL) Resistors
The 330 ohm EOL (End of Line) resistor provided in the accessory bag must be inserted between the NA and
NB terminals of the first and last modules on the RS-485 network. These are the modules physically located at
the ends of the RS-485 network cabling.
330R 330R
First Module on RS-485 Network Last Module on RS-485 Network
To
Next
Module
From
Previous
Module
NA N+ N- NB
NA N+ N- NB
PRT-PSU-DIN-2A | Protege DIN Rail 2A Intelligent Power Supply | Installation Manual 18