Analog Modules
4-110
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 331; AI 8 x 13 bits
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 250 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs
• For resistance-type
sensor
8
8
Length of cable
• Shielded max. 200 m
max. 50 m at 50 mV
Voltages, Currents, Potentials
Constant current for
resistance-type sensor
• Resistance ther-
mometer and
resistance meas-
urement 0 ... 600 Ω
0.83 mA
• Resistance meas-
urement 0 ... 6 kΩ
0.25 mA
Isolation
• Between channels and
backplane bus
Yes
• Between the channels No
Permitted potential
difference
• Between the inputs
(E
CM
)
2.0 VDC
• Between the inputs
and M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with 500 VDC
Current consumption
• From the backplane
bus
max. 90 mA
Power dissipation of the
module
typ. 0.4 W
Analog value generation
Measuring principle Integrating
Integration time/resolution
(per channel)
• Programmable Yes
• Noise suppression
for frequency f1 in Hz
50 60
• Integration time in
milliseconds
60 50
• Basic conversion
time including
Integration time in
milliseconds
66 55
Additional conversion
time for measuring
resistance, in ms
66 55
• Resolution in bits (incl.
Overrange
13 bits 13 bits
Suppression of interference, Limits of Error
Noise suppression for f = n (f1 " 1 %),
(f1 = interference frequency) n = 1.2
• Common-mode
interference
(U
CM
< 2 V)
> 86 dB
• Series-mode noise
(peak value of
noise < nominal
value of input
range)
> 40 dB
Crosstalk between the
inputs
> 50 dB
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