II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Analog Modules
3.3.2 Connecting Voltage Sensors
3-32
Fig. 3-9 shows the connection of voltage sensors to the isolated analog input
module SM 331; AI 8 x TC/4 x RTD.
+
- U CH0
.
.
.
+
U CH7
-
M+
M-
M+
M-
ADU
P5V
M internal
Logic
Backplane
bus
Fig. 3-9 Connection of voltage sensors to the isolated analog input module SM 331;
AI 8 x TC/4 x RTD
The information provided in Section 3.2 on differences in potential UCM and
UISO between the individual circuits still retains its validity.
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04