Fig. 34 Example 1A, High-Side Measurement; Fig. 35 Example 2, High-Side/Low-Side Measurement - Beckhoff EL3182 Documentation

Mounting and wiring
Fig. 34: Example 1a, high-side measurement
Example 2
The same EL3012 is now again connected with the two 20 mA sensors, although this time with one low-side
measurement at 5 V and one high-side measurement at 12 V. This results in significant potential differences
U > 10 V (applicable to EL30xx) between the two channels, which is not permitted.
CM
Fig. 35: Example 2, high-side/low-side measurement
To rectify this, GND can in this case be connected externally with an auxiliary potential of 6 V relative to
int
"0 V". The resulting A/GND will be in the middle, i.e. approx. 0.3 V or 11.6 V.
int
Example 3
In the EL3xx4 terminals GND is internally connected with the negative power contact. The choice of
int
potential is therefore limited.
40 Version: 1.2 EL3182