VIPA 238-2BC00 - General

Chapter 2 Analog input modules Manual VIPA System 200V
2-2 HB97E - SM-AIO - Rev. 12/32
General
You must only use screened cable when you are connecting analog
signals. These cables reduce the effect of electrical interference. The
screen of the analog signal cable should be grounded at both ends. When
there are potential differences between the cable ends, there may flow a
current will to equalize the potential difference. This current could interfere
with the analog signals. Under these circumstances it is advisable to
ground the screen of the signal cable at one end only.
Our analog input modules provide a large number of input configurations
for 2- and 4wire transducers.
Please remember that sensors require an external power supply. You have
to connect an external power supply in line with any 2wire sensor. The
following diagram explains the connection of 2- and 4wire sensors:
2wire interfacing 4wire interfacing
1
2
3
4
5
6
7
8
9
10
DC 24V
transducer 1
4 ... 20mA
transducer 2
4 ... 20mA
transducer 3
4 ... 20mA
transducer 4
4 ... 20mA
1
2
3
4
5
6
7
8
9
10
DC 24V
DC 24V
DC 24V
DC 24V
DC 24V
DC 24V
DC 24V
-
-
-
-
+
+
+
+
transducer 1
4 ... 20mA
transducer 2
4 ... 20mA
transducer 3
4 ... 20mA
transducer 4
4 ... 20mA
+
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
Note!
Please ensure that you connect the sensors with the correct polarity!
Unused inputs should be short circuited by placing a link between the
positive pole and the common ground for the channel.
By using the SFCs 55, 56 and 57 you may change the parameters of the
analog modules during runtime via the CPU 21x.
For diagnosis evaluation during runtime, you may use the SFCs 51 and 59.
They allow you to request detailed diagnosis information and to react to it.
Cabling for
analog signals
Connecting
current
sensor
Parameterization
and diagnosis
during runtime