ABB UNITROL 1020 - Page 45

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 37
The electrical connections should be performed according to CAN standard guidelines. A
120 ohm resistor normally used to terminate the bus, is already included in the device
and can be used by placing a jumper bridge over the X1302 terminals. The location of the
X1302 terminals can be identified by referring to Chapter 3.3.2.4 Terminal Block.
The CAN interface cannot be used for remote access and for any other purpose not
explicitly indicated in this user manual.
CAN for UN1000-PM40
For more information see the UN1000-PM40 User Manual.
CAN for Double Channel
When using Double Channel, the CAN connections should be performed as shown in the
figure below (CAN connection for Double Channel SW). The cable used for the CAN
communication has to be connected between the two channels, i.e. Main and Redundant,
and not to any other device. To properly terminate the bus, place one jumper bridge over
the X1302 terminals of each device.
Cable type requirements
 Cable cross-section: 2 x 2 x 0.34 mm
2
 Cable impedance: 120 Ohm
 Maximum cable length: 30 meters.
 Shielded twisted pair. The cable shielding must be grounded.
The Double Channel is an optional feature that should be previously activated in the
device (by password or product rubric), configured and the communication activated. For
more information refer to Chapter 3.4.4.4- Double Channel (DCH).
Channel 1
Double Channel CAN Communication
Channel 2
RH RL RS CG CH CL
-
+
-
+
485
gnd
CAN
X1300
RS-485
X1302
CAN
CV CS
5V Shield
Shielding
RH RL RS CG CH CL
-
+
-
+
485
gnd
CAN
X1300
RS-485
X1302
CAN
CV CS
5V Shield
RSRH RL CV
CH CLCS
CG
Shielding
RSRH RL CV
CH CLCS
CG
Figure 3-7 CAN connection for Double Channel SW