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Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Technical specifications of the SM 331; AI 8 14 Bit High Speed
Dimensions and Weight
Dimensions W H D
(in millimeters)
40 125 117
Weight Approx. 230 g
Data for Specific Module
Supports clocked operation Yes
Number of inputs 8
Length of cable
S Shielded max. 200 m
Voltages, Currents, Potentials
Rated supply voltage of the
electronics L +
24 VDC
S Reverse polarity
protection
Yes
Power supply of the
transmitters
S Supply current max. 30 mA (per channel)
S Short-circuit-proof Yes
Isolation
S Between channels and
backplane bus
Yes
S Between the channels No
S Between channels and
power supply of the
electronics
Yes
Permitted potential
difference
S Between inputs and
M
ANA
(U
CM
)
– At signal = 0 V
– Not for 2-wire
transmitter
11 VDC / 8 VAC
S Between the inputs
(ECM)
11 VDC / 8 VAC
S Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with
S Channels against
backplane bus and load
voltage L +
500 VDC
Current consumption
S From the backplane bus max. 100 mA
S From load voltage L +
(without 2-wire
transmitter)
max. 50 mA
Power dissipation of the
module
typ. 1.5 W
Analog value generation
Measuring principle Instantaneous value
conversion
Integration time/conversion
time/ resolution (per
channel)
S Parameters can be
assigned
Yes
S Basic conversion time
per channel
52 ms
S Resolution (incl.
overrange)
14 bits
S Noise suppression for
frequency f1 in Hz
None 400 60 50
S Basic execution time of
the module (depending
on the number of
channels enabled)
0.42 ms
Suppression of interference, Limits of Error
Noise suppression for f = n (f1 " 1 %),
(f1 = interference frequency) n= 1,2 ...
S Common-mode
interference
(U
CM
< 11 V
SS
)
> 80 dB
S Series-mode
interference (peak value
of interference < rated
value of input range)
> 40 dB
Crosstalk between the
inputs
> 65 dB
Operational limit (in the entire temperature range,
with reference to the input range)
S Voltage input " 1 V " 0.3 %
" 5 V " 0.4 %
" 10 V " 0.3 %
1 to 5 V " 0.4 %
S Current input " 20 mA " 0.3 %
0 to 20 mA " 0.3 %
4 to 20 mA " 0.3 %
Basic error limit (operational limit at 25 _C, with reference
to the input range)
S Voltage input " 1 V " 0.2 %
" 5 V " 0.25 %
" 10 V " 0.2 %
1 to 5 V " 0.25 %
S Current input " 20 mA " 0.2 %
0 to 20 mA " 0.2 %
4 to 20 mA " 0.2 %
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