Siemens Simatic S7-300 Specifications Page 142
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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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The figure below shows the wiring diagram of the current/voltage inputs operated
with 2-/4-wire measuring transducers.
2-wire-measuring
transducer
AI2
AI2
AI2
u
I
c
8
9
10
M
M
ANA
20
We recommend you connecting
AIx
C
and M
ANA
with a jumper
+
-
+
+24V
-
Al
0
: Pin 2 to 4
AI
1
: Pin 5 to 7
Al
2
: Pin 8 to 10
Al
3
: Pin 11 to 13
Figure 7-7 Connection of a 2-wire measuring transducer to an analog current/voltage input
of CPU 313C/314C-2
4-wire-measuring
transducer
AI : Pin 2 4
AI : Pin 5 7
AI : Pin 8 10
AI : Pin 11 to 13
0
1
2
3
L+
AI2
AI2
AI2
AI3
AI3
AI3
u
I
c
u
I
c
8
9
10
11
12
13
M
ANA
20
M
M
+
-
+
-
Close unwired input channels
briefly and connect Alx
C
with M
ANA
.
With a 4-wire-measuring transducer,
we recommend connecting Alx
C
with M
ANA
.
to
to
to
Figure 7-8 Wiring of an analog current/voltage input of CPU 313C/314C-2 with 4-wire
measuring transducer
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CPUs 31xC use the measurement principle of actual value encoding. Here they
operate with a sampling rate of 1 kHz, that is, a new value is available at the input
word register once every millisecond. This value can then be read via user
program (e.g. L PEW). The "old" value is read again if the access times are lower
than 1 ms.
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