EWIO
2
User Manual
V 1.1 | Stand 10/2020
Seite 23 von 96
METZ CONNECT GmbH | Im Tal 2 | 78176 Blumberg | Germany
Tel. +49 7702 533-0 | Fax +49 7702 533-433
For additional documentations look at www.metz-connect.com
To reduce the influence of interference on the bus signals, a shielded cable with twisted pairs
of wires should be used.
The bus cable must be laid in series or line topology. Star topology is not permitted.
A terminating resistor of 120 Ohm must be connected in parallel with the bus lines at each
end of the cable.
Do not connect the shield of the bus line to a minus terminal of the EWIO
2
.
Wiring examples:
5.5.
Expansion bus interface
The connections of the extension bus interface are called B+ and A-
and are located to the left and right of the flap.
B+ indicates the non-inverted bus line and
A- indicates the inverted bus line.
The interface is electrically isolated.
Die Schnittstelle ist mit „Failsafe-Bias“- Widerständen ausgestattet.
A maximum of 6 expansion modules of the MR-xxx series can be connected to the EWIO
2
via
jumper plug. The jumper plug connects supply voltage and bus to the expansion modules.
Each expansion module connected to the EWIO
2
must be set to an individual address in the
range 1 to 6. If an address is assigned twice, the operation of the expansion modules is not
guaranteed.
Note !
When using an NG4 power supply unit for the supply voltage, the total power
requirement of the EWIO2 and the expansion modules must be taken into
account. If it exceeds the maximum output current of NG4, it is possible to use a
second power supply unit as shown in the picture.
