25 Analog input/output module ±10 V XN-322-4AIO-U2
25.4 Diagnostics
XN300 slice modules
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187
25.3.3 Measurements using sensors
In order to measure a sensor's output voltage via an analog input, a differen-
tial voltage measurement is carried out without connecting either input cable
to ground (GND). The signal being measured must fall within the input's per-
missible common mode range.
Voltage measurement for floating voltage sources
When using a non-floating voltage source (a voltage source with reference to
GND), the input must be configured as a differential analog input by means of
software. The corresponding parameter can be configured using object
0x51A0. In order to avoid errors in measurement caused by compensating
currents, there must not be any connection between analog input AI- and
GND when it comes to the analog input.
Voltage measurement for non-floating voltage sources
When using a floating voltage source (a voltage source without reference to
GND), the input must be configured as a GND ground reference by means of
software or an external reference to GND must be established. The corre-
sponding parameter can be configured using object 0x51A0. The GND refer-
ence will prevent the measurement signal from moving out of the permissi-
ble measurement range.
Figure 102:
Wiring analog inputs in order to measure one non-floating voltage source (1+/1-)
and one floating voltage source (2+/2-)
25.4 Diagnostics
Cable break diagnostics will only be run for the analog inputs. The R voltage
reference outputs will be individually monitored for overcurrent, short-cir-
cuits, and an excessively high total current. Object 0x31A3 delivers the diag-
nostics – please refer to manual „CANopen Gateway XN312-GW-CAN“,
MN050003.
1+ 1-
2+ 2-
X2
R
R
R
R
-
1+
-
2+
PE
24 V
0 V
PE
X1
+
U
-
+
U
-
PE
PE
X3
Summary of Contents for XN300
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