Siemens M7-400, S7-400 Two-Conductor Connection of Loads to a Voltage Output

Analog Modules
5-61
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
+24 V
L+
QV
S+
S–
MANA
0 V
MUISO
Chassis ground
RL
Figure 5-21 Connecting Loads to a Voltage Output of an Isolated AO over a
Four-Conductor Connection
Two-Conductor Connection of Loads to a Voltage Output
In the case of a two-conductor connection, connect QV to S+ and MANA to S– on
the front connector. However, this will not produce the accuracy of a four-conductor
connection.
Connect the load to terminals QV and to the reference point of the measuring
circuit MANA of the module.
+24 V
L+
QV
S+
S–
MANA
0 V
MUISO
Chassis ground
RL
Figure 5-22 Two-Conductor Connection of Loads to a Voltage Output of an Isolated AO