5/2004 Manual for connection and operation of the EV-94 EB page 10 of 28
3.4.3. Connection with configured push-pull-switching output
Connection of a semiconductor-relay
3.5. Common wiring of several EV-94 EB
Inputs and outputs are not electrically isolated. When interconnecting several EV-94 EB`s you have to make
sure that there is no potential displacement.
Make sure to observe the following points:
- When several EV-94 EB`s are connected to the same power supply unit it is highly recommended to isolate
the sensors, measuring transducers etc.
- When the sensors, measuring transducers etc. are electrically connected, and you can’t manage to isolate
them, you should use separate electrically isolated power supply units for each devices. Please note, that
an electric connection may also be created via the medium to be measured (e.g. pH-electrodes and con-
ductivity-electrodes in fluids).
+
-
Uin
Semicond.-
relay
+
_
Supply
9-28 VDC
1
2
3
4
5
