Power Supply; Communication Port - Unitronics Samba SM70-J-RA22 Installation Manual

Power Supply

The controller requires an external 24VDC power supply.
 The power supply must include double insulation. Outputs must be rated as
SELV/PELV/Class2/Limited Power.
 Use separate wires to connect the functional
earth line (pin 3) and the 0V line (pin 2) to the
system earth ground.
 Install an external circuit breaker. Guard
against short-circuiting in external wiring.
 Double-check all wiring before turning
on the power supply.
 Do not connect either the 'Neutral' or 'Line'
signal of the 110/220VAC to device's 0V pin
 In the event of voltage fluctuations or non-
conformity to voltage power supply
specifications, connect the device to
a regulated power supply.
Earthing the PLC+HMI
To maximize system performance, avoid electromagnetic interference by:

Mounting the controller on a metal panel.

Connect each common and ground connection directly to the earth ground of your system.

For ground wiring uses the shortest and thickest possible wire.

Communication Port

 Turn off power before making communications connections.
 Always use the appropriate port adapters.
Caution
SM43/SM70-J-RA22
This series comprises a USB port.
 The USB port in SM43 Series is not isolated. Make sure that the PC and the controller
Caution
are grounded to same potential.
The USB port may be used for programming, OS download and PC access.
SM35-J-RA22
This series comprises a build-in RS232 port.
 Signals are related to the controller's 0V; the same 0V is used by the power supply.
Caution  The serial port is not isolated. If the controller is used with a non-isolated external device,
avoid potential voltage that exceeds ± 10V.
Use RS232 to download programs from a PC, and to communicate with serial devices and
applications, such as SCADA.
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Samba™ PLC+ HMI Installation Guide
Unitronics