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R2 CAN Installation manual
5.4 CAN cabling
All available CAN components are shown in the Annex in section 12.2 p. 65 et sequ.
Connection examples can be found in section 12.3 from p. 68 on.
• An IRMA CAN BUS is a line-type BUS with short branch lines to the BUS devices.
• The sensor is connected to the IRMA CAN BUS with special connectors (sCON).
• The BUS - sensor connection of the sCON-S (standard) is a branch line from its
CAN interface to the sensor connection. Any further sensors are connected to the
BUS via M12 H couplers.
• sCON-F-12 is equipped with two CAN connections. In addition to the electrical
connection of a sensor to the IRMA CAN BUS they also serve as a Y coupler, due to
their internal wiring. The BUS is continued from the second CAN connector to the
next sensor. At the last sensor a termination is installed.
• IRMA CAN sensors are connected to the CAN BUS with 5-pole M12 CAN connectors (m/f)
(for a description of the CAN connectors see section 1.3.1, p.9).
• From the data transmission point of view the maximum line length of the IRMA-CAN
BUS is 40 m.
• H couplers ensure branching (branch line) to up to two CAN BUS devices per coupler.
The branch length describes the maximum length between a device (sensor, IRMA
gateway, CAN USB converter) and the CAN BUS (coupler).
• The maximum branch length (at 125 kbit/s) is 2 m.
• Unused branches on H couplers must be closed using M12 plug screws or closing caps.
• All devices (IRMA gateway, sensors and USB converter) can be located at any place in the
IRMA-CAN BUS.
• The individual devices are interconnected with K-M12CAN-XX-xm CAN cables and M12
H couplers of the CAN type ("XX"= 03 for K2
5
, "XX"= 04 for K35 and x for different cable
lengths available).
Special care is required when connecting an H coupler. After insertion of the positive-
locking plug-in connection it must be possible to tighten the knurled nut of the connector
simply by hand. Otherwise the connection is wedged and must be opened again.
When screwing a connector to an H coupler the maximum torque of 0.4 Nm must not be
exceeded.
5
K2, K3 are the cable characteristics available, see section 5.1, page 28.
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