Siemens Simatic S7-300 - Page 299

Analog modules
6.8 Analog input module SM 331; AI 2 x 12 bit; (6ES7331-7KB02-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-65
Note
Resistance measurements are only available at one channel of the analog input module. The
"2nd" channel is used for current impression (I
C
).
The "1st" returns the measured value. The "2nd" channel is assigned the default overflow
value "7FFF
H
."
Wiring: 2 and 4-wire measuring transducer for current measurement







9


'&
/
0
/
0
/







 0
7

6)
0ದ
0ದ
0
0
&RPS
&+
&+
&RPSದ0$1$
'08
'08
%DFNSODQHEXV
FRQQHFWLRQ
(OHFWULFDO
LVRODWLRQ
,QWHUQDO
VXSSO\
,QWHUQDO
FRPSHQVDWLRQ
([WHUQDOFRPSHQVDWLRQ
1RQH
$'&
&XUUHQW
VRXUFH
0XOWL
SOH[HU
0HDVXULQJ
UDQJHPRGXOHV
(TXLSRWHQWLDO
ERQGLQJ
)XQFWLRQDO
JURXQG
Figure 6-21 Wiring and block diagrams
Measuring range module settings
Measuring range Measuring range module setting
2-wire transducer 4 mA to 20 mA D
4-wire transducer ± 3.2 mA
± 10 mA
0 mA to 20 mA
4 mA to 20 mA
± 20 mA
C