Analog I/O - Siemens Simatic S7-300 Technical Data Manual

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
6.6.2

Analog I/O

Wiring of the current/voltage inputs
The figure below shows the wiring diagram of the current/voltage inputs operated with
2-/4-wire measuring transducers.
Figure 6-1
Figure 6-2
6-34
+
2-wire
signal converter
-
8
AI2
u
+
9
AI2
I
-
10
AI2
c
20
M
ANA
We recommend connecting AIx
Connection of a 2-wire measuring transducer to an analog current/voltage input of
CPU 313C/314C-2
8
AI2
u
+
9
AI2
I
-
10
AI2
c
11
AI3
u
12
AI3
I
13
AI3
c
20
M
ANA
Connection of a 4-wire measuring transducer to an analog current/voltage input of
CPU 313C/314C-2
+ 24 V
M
C
L+
+
4-wire
-
signal converter
M
Short-circuit non-wired input channels
and connect Alx with M
ANA .
C
We recommend connecting Alx
when using the 4-wire signal converter.
Al : Pin 2 to 4
0
AI : Pin 5 to 7
1
Al : Pin 8 to 10
2
Al : Pin 11 to 13
3
with M using a bridge.
ANA
AI : Pin 2 to 4
M
0
AI : Pin 5 to 7
1
AI : Pin 8 to 10
2
AI : Pin 11 to 13
3
with M
C ANA
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05