II - DCE FEL ČVUT v Praze

I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
Fig. 3-11 shows the connection of current sensors as 2-wire transducers to the
analog input module SM 331; AI 4 x 0/4...20 mA and AI 2 x 0/4...20 mA
HART.
, ,
MU
e.g.
pressure,
temperature
L+
M
I
4...20 mA
U M
L 0+
M 0+
M 0-
RS 50
Transducer supply
A
D
Logic
Backplane
bus
Fig. 3-11 Connection of 2-wire transducers to the analog input module SM 331; AI
4 x 0/4...20 mA and AI 2 x 0/4...20 mA HART.
Fig. 3-12 shows the connection of current sensors as 4-wire transducers with
external transducer supply to the analog input module SM 331;
AI 4 x 0/4...20 mA and AI 2 x 0/4...20 mA HART.
, ,
MU
e.g.
pressure,
temperature
U v +
U v -
L+
M
0/4...20 mA
U M
L 0+
M 0+
M 0-
RS 50
SIMATIC S7 Ex Analog Modules
Transducer supply
A
D
Logic
Backplane
bus
Fig. 3-12 Connection of 4-wire transducers with external supply to the analog input
module SM 331; AI 4 x 0/4...20 mA and AI 2 x 0/4...20 mA HART.
3-35