Analog modules
6.9 Analog input module SM 331; AI 8 x RTD; (6ES7331-7PF01-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-75
Caution
Any faulty wiring of 3-wire connections may cause unforeseeable module states and
hazardous plant states.
Wiring: 3-wire connection
For 3-wire connections to SM 331; AI 8 x RTD, bridge M
+
and I
C+
.
Always wire the connected I
C-
and M
-
cables directly to the resistance thermometer.
Wiring: 2-wire connection
For 3-wire connections to SM 331; AI 8 x RTD, bridge M
+
and I
C+
as well as M
-
and I
C-
.
On the 2-conductor connection, there is no compensation for line resistors. The line resistors
are measured at the same time!
Technical data
Technical data
Dimensions and weight
Dimensions W x H x D (mm) 40 x 125 x 117
Weight Approx. 272 g
Module-specific data
Isochronous mode supported No
Number of inputs 8
Cable length
• shielded
max. 200 m
Voltages, currents, electrical potentials
Rated electronics supply voltage L +
• Reverse polarity protection
24 VDC
Yes
Constant measuring current for resistive transducers max. 5 mA
Electrical isolation
• between channels and the backplane bus
• between channels and electronics power supply
• between channels
in groups of
Yes
Yes
Yes
2
Permissible potential difference
• between channels (U
CM
)
• Between the channels and M
internal
(V
iso
)
60 VAC / 75 VDC
60 VAC / 75 VDC
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