Connecting Loads/Actuators To A Voltage Output Via A 4-Wire Circuit (Example Tb 16Sc) - Siemens Metro 21 M216KA Operator's Manual

Connecting Loads
to a Voltage
Output
1L+
1M
+24V
M
Figure 11-10 Connecting Loads/Actuators to a Voltage Output via a 4-Wire Circuit (Example TB 16SC)
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
If you connect the load to the voltage output via a 4-wire circuit, high accu-
racy is obtained.
Slot A
AO 10V/1..5V
2L+ A1 A2
QV+ S
+
2M A3 A4
QV–
S–
R
L
The sensor lines (S +, S –) must be connected directly to the load. The volt-
age is thus measured and adjusted directly on the load.
You can also use only QV+ and QV– by bridging QV+ with S+ and QV–
with S– on the terminal block. This entails a loss of accuracy. In this case, the
line resistances are not compensated.
S + and S – must not remain unwired.
SC Analog Electronic Modules – Parameters
Slot B Slot C
B1 B2 C1
B3 B4 C3
C2
C4
11-27