Analog Modules
4-127
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 331; AI 8 x RTD
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 272 g
Data for Specific Module
Supports clocked
operation
No
Number of inputs 8
Length of cable
• Shielded max. 200 m
Voltages, Currents, Potentials
Power rated voltage of the
electronics L+
24 VDC
• Reverse polarity protection Yes
Constant measured current for
resistance-type sensor
max. 5 mA
Isolation
• Between channels and
backplane bus
Yes
• Between channels and
power supply of the
electronics
Yes
• Between the channels
In groups of
Yes
2
Permitted potential difference
• Between the inputs (U
CM
) 75 VDC / 60 VAC
• Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with 500 VDC
Current consumption
• From the backplane bus
• From the power supply L+
max. 100 mA
max. 240 mA
Power dissipation of the module typ. 4.6 W
Analog value generation
Measuring principle Integrating
Module filtering mode 8 channels, hardware
Integration/conversion time/
resolution (per channel)
• Programmable Yes
• Basic conversion time in
ms
80
• Additional conversion time
for measuring resistance,
in ms
185*
• Additional conversion time
for open-circuit monitoring,
in ms
100
• Resolution including sign 16 bits
• Noise suppression
for interference frequency
f1 in Hz
400 / 60 / 50
Smoothing of the measured
values
None / low/
average/ high
Conversion time (per channel) 100 ms
Basic response time of module
(all channels enabled)
200 ms
Module filtering mode 8 channels, software
Integration/conversion time/
resolution (per channel)
• Programmable Yes
• Basic conversion time in
ms
8 / 25 / 30
• Additional conversion time
for measuring resistance,
in ms
45 / 79 / 89*
• Additional conversion time
for open-circuit monitoring,
in ms
20 / 37 / 42
• Resolution including sign 16 bits
• Noise suppres
sion for interference
frequency f1 in Hz
400 / 60 / 50
Smoothing of the measured
values
None / low/
average/ high
Conversion time (per channel) 20 / 37 / 42 ms
Basic response time of module
(all channels enabled)
40 / 79 / 84 ms
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