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Considering that the device has no switch, it is necessary to
install one before it, with a protective fuse.
The switch has to be positioned in the immediate vicinity of
the device and be easy for the operator to reach.
For the 24 Vdc power supply unit, use a separate line from
that used for electromechanical power devices such as relays,
contactors, solenoids, etc.
If there are considerable changes in the mains voltage, use
a voltage stabiliser.
Near to high frequency generators or arc welders, use
adequate grid filters.
Connect the power cables to the power connector.
Fit the cylindrical nucleus in ferrite, supplied with the product,
as close as possible to the device to limit the susceptibility of
the device to electromagnetic disturbance (figure
14).
The 24 Vdc power supply cables must follow a separate path
from the power cables of the plant or machine.
1 2 3
+VI24
GNDI
+
-
Figure 14 - CAN-IO power connection
Attention: Amake sure that the earth connection is
efficient. A non-existent or inefficient earth connection
can make the operation of the device unstable, due
to excessive environmental
disturbance. In particular, check that:
• the voltage between ground and earth is <1V;
• the ohm resistance is < 6 Ω.
CAN
Connect the cable for the CAN field bus.
The CAN bus connects the CAN-IO modules to the Integrated
Controller and Operator Panel.
Considering that the CAN port is opto-isolated, it is not
necessary to disconnect the power to the device before
connecting it.
For the wiring of the line, use an approved cable.
Fasten the cable connector to that of the controller with the
appropriate screws.
80990B_MHW_CAN-IO_12-2016_ENG
FERRITE
+24 Vdc ±25%
700 mA max
1
Pin
Name
1
2
CAN_L
3
GND
4
5
EARTH
6
7
CAN_H
8
9
The CAN-IO module is equipped with a line termination.
Attention: if the module is the latest device on the
CAN line, activate the termination, switching both
switches to ON (see figure 15).
The CAN-IO module leaves the factory with the
termination deactivated (OFF).
ON
OFF
Figure 15 - Switch for CAN line termination
The CAN line must be terminated at both ends.
If the device at the end of the CAN line is not equipped with its
own termination, it is possible to terminate the line installing
a resistor (120 Ω, 1/4W, tolerance 5%), as shown in figure 16.
Figure 16 - CAN bus line terminations
9
Description
CAN-Low (CAN-)
Ground (mass)
Earth
CAN-High (CAN+)
ON
1
2
...
1
2
19
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