Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical Data
6-34 Manual, 01/2006 Edition, A5E00105475-06
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.
9
$1$
0
0
F
,
X
$,
$,
$,
$,
$,
$,
$,
:HUHFRPPHQGFRQQHFWLQJ$,[
&
ZLWK0
$1$
XVLQJDEULGJH
ZLUH
VLJQDOFRQYHUWHU
3LQWR
3LQWR
3LQWR
3LQWR
Figure 6-1 Connection of a 2-wire measuring transducer to an analog current/voltage input of
CPU 313C/314C-2
$,
$,
$,
$,
$,
$,
X
,
F
X
,
F
/
0
$1$
0
0
$,
$,
$,
$,
ZLUH
VLJQDOFRQYHUWHU
3LQWR
3LQWR
3LQWR
3LQWR
6KRUWFLUFXLWQRQZLUHGLQSXWFKDQQHOV
DQGFRQQHFW$O[
&
ZLWK0
$1$
:HUHFRPPHQGFRQQHFWLQJ$O[
&
ZLWK0
$1$
ZKHQXVLQJWKHZLUHVLJQDOFRQYHUWHU
Figure 6-2 Connection of a 4-wire measuring transducer to an analog current/voltage input of
CPU 313C/314C-2
Measurement principle
31xC CPUs 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 peripheral input word
register once every millisecond. This value can then be read via user program (e.g. L PEW).
The "previous" value is read again if access times are shorter than 1 ms.
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