Wiring Guidelines
In order to ensure that the device will operate properly and to avoid electromagnetic
interference:
Use a metal cabinet. Make sure the cabinet and its doors are properly earthed.
Use wires that are properly sized for the load.
Use shielded twisted pair cables for wiring High Speed and Analog I/O signals.
Use shielded cables for wiring thermocouple and RTD signals.
In either case, do not use the cable shield as a signal common / return path.
Route each I/O signal with its own dedicated common wire. Connect common wires
at their respective common (CM) points at the controller.
Individually connect each 0V point and each common (CM) point in the system to the
power supply 0V terminal, unless otherwise specified.
Individually connect each functional ground point ( ) to the earth of the system
(preferably to the metal cabinet chassis).
Use the shortest and thickest wires possible: less than 1m (3.3’) in length, minimum
thickness 14 AWG (2 mm
2
).
Connect the power supply 0V to the earth of the system.
Earthing the cables' shield:
Connect the cable shield to the earth of the system (preferably to the metal cabinet
chassis). Note that the shield must be connected only at one end of the cable; it is
recommended to earth the shield at the PLC-side.
Keep shield connections as short as possible.
Ensure shield continuity when extending shielded cables.
NOTE
For detailed information, refer to the document System Wiring Guidelines,
located in the Technical Library in the Unitronics’ website.
Wiring the Power Supply
The controller requires an external power supply.
In the event of voltage fluctuations or non-conformity to voltage power supply
specifications, connect the device to a regulated power supply.
Connect the +V and 0V terminals as
shown in the accompanying figure.
Ethernet
CAT-5e shielded cable with RJ45 connector
USB Device
Use a standard USB cable, Type mini-B
USB Host
Standard USB Type-A plug
8 Unitronics
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