Siemens SIMATIC S7-300 Module data - Connecting Loads to a Voltage Output of a Non-Isolated AO over a Two-Conductor Connection

Analog Modules
4-69
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting loads to a voltage output of a non-isolated module via a
two-conductor connection
With a two-conductor connection, the S+ and S– terminals can be left open.
However, you will not achieve the accuracy of a four-conductor connection.
Connect the load to terminals Q
V
and the reference point of the measuring circuit,
M
ANA
.
M
L+
Backplane
bus
DAC
M
internal
L+
M
Ground bus
CPU
R
L
Q
V
M
ANA
Logic
Figure 4-29 Connecting Loads to a Voltage Output of a Non-Isolated AO over a Two-Conductor
Connection