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R2 CAN Installation manual
6.1 Power supply of IRMA MATRIX sensor
The nominal voltage of the sensor is 24 V. The wires of the cables‘ opened end must be
connected as shown in the table below:
Table 4:
Potential
0 V = VP-
or GND
24 V DC = VP+
CAN-H
CAN-L
M12 connector (f),
CAN type/
K-M12POW-B-04-2m (= K3)
6
K-M12POW-B-oE-04-2m (= K3)
6
M12 connector (f)
of the CAN type/
wires and shield
K-M12CAN-B-01-1m (= K2)
6
M12 connector (m),
CAN type/
K-M12CAN-S-XX-1m (= K2/K3)
6
Red
For assignment of the connectors see
section 1.3.1, p. 9
Pin 2
The 4-wires can be used for power supply (wires: red and black) and/or for connection to
the CAN communication of the BUS (wires: white and blue).
If certain wires are not required, they must absolutely be insulated in order to avoid any
accidental contact resulting in communication disturbances of the sensors.
If the power is supplied at the beginning of the CAN BUS, the number of sensors is limited
to a maximum of 4 (for installation examples of the power supply at the beginning see Fig.
44, p. 69 and Fig. 45, p. 70).
If the power is supplied in the center of the CAN BUS, this limitation does not apply (see Fig.
45, p. 70 and Fig. 46, p. 71).
For installations with more than 4 sensors we recommend connecting the IRMA gateway
and the power supply in the center of the BUS.
Generally the following applies to operation of 4 sensors:
In case of continuous operation in the lower limit range of nominal voltage (16.8 V), the
permissible cable length is reduced from 50 m to approx. 22 m. The effective cable length
can be reduced by connecting the power supply in the center of the CAN BUS. If longer
cable lengths are required, the permissible cable length can be extended by connecting an
additional power supply. It must be ensured that there are no potential differences
between the power supply systems.
6
K2, K3 are the cable characteristics available, see section 5.1, page 28.
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