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Installation- / connection notes, pin assignments
TR-Electronic GmbH 2016, All Rights Reserved
Printed in the Federal Republic of Germany
Page 66 of 153
TR-EMO-BA-GB-0022 v03
09/29/2020
6 Installation- / connection notes, pin assignments
EtherCAT supports linear, tree or star structures. The bus or linear structure used in
the field buses is thus also available for Ethernet. This is particularly practical for
system wiring, as a combination of line and stubs is possible.
For transmission according to the 100Base-TX Fast Ethernet standard, patch cables
in category STP CAT5 must be used (2 x 2 shielded twisted pair copper wire cables).
Recommendation:
As Ethernet cables green readily assembled PROFINET cables with double shielding
and D-coded M12x1 connectors are recommended.
The cables are designed for bit rates of up to 100 Mbit/s. The transmission speed is
automatically detected by the drive and does not have to be set by means of a switch.
Addressing by switch is also not necessary; this is done automatically using the
addressing options of the EtherCAT master.
The cable length between two subscribers may be max. 100 m, a total of 65535
subscribers are possible in the EtherCAT network.
In some cases the pin assignment of the power plug provides no separate logic
supply, but instead a 10A open drain output for a ballast resistor that must be attached
to the positive power supply.
The resistance must be chosen according to the power supply voltage:
Ballast resistance = Power supply voltage / 10A
The pins for power + and
– are reversed compared to a power cable for a traditional
encoTRive. This prevents the destruction of the ballast output, if by accident a
traditional cable is plugged in. Then the protection against reversed polarity blocks any
supply current and nothing at all will happen.
Currently there is no plug for the digital and analog I/Os. Other pin assignments are
available on request.
If the power line is not directly connected to a supply, but is instead turned on by a
switch or a relay, for a short moment very high inrush currents of several 100 A may
occur. Depending on the length and the positions of the cables, these inrush currents
may create strong electromagnetic interferences.
Then it is strongly recommended, to use power cables with twisted pairs for + and
–
and a shield, that is connected to earth on both ends of the cable.
Additionally the largest possible snap ferrite core should be attached on the power
cable close to the encoTRive device.
Recommended parts: STAR-TEC Snap Ferrite 74271221 or 74271222 from Würth.
Download pin assignment, version with
“Valve Male Connector”:
www.tr-electronic.de/f/TR-EMO-TI-DGB-0109
Download pin assignment, version with “M23 Male Connector”:
www.tr-electronic.de/f/TR-EMO-TI-DGB-0112