Siemens Simatic S7-300 - Page 305

Analog Modules
4-99
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Technical specifications of the SM 331; AI 8 x 14 bit High Speed
Dimensions and Weight
Dimensions W x H x D
(in millimeters)
40 x 125 x 117
Weight Approx. 230 g
Data for Specific Module
Supports clocked operation Yes
Number of inputs 8
Length of cable
• Shielded max. 200 m
Voltages, Currents, Potentials
Rated supply voltage of the
electronics L +
24 VDC
• Reverse polarity
protection
Yes
Power supply of the
transmitters
• Supply current max. 30 mA (per channel)
• Short-circuit-proof Yes
Isolation
• Between channels and
backplane bus
Yes
• Between the channels No
• Between channels and
power supply of the
electronics
Yes
Permitted potential
difference
• Between inputs and
M
ANA
(UCM)
– At signal = 0 V
– Not for 2-wire
transmitter
VDC 11/VAC 8 V
• Between the inputs
(E
CM
)
VDC 11/VAC 8 V
• Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with
• Channels against back
plane bus and load
voltage L +
500 VDC
Current consumption
• From the backplane bus max. 100 mA
• From load voltage L +
(without 2–wire
transducer)
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)
• Parameters can be
assigned
Yes
• Basic conversion time
per channel
52 s
• Resolution (incl.
overrange)
14 bits
• Noise suppression for
frequency f1 in Hz
None 400 60 50
• Basic execution time of
the module
(independent of the
number of released
channels)
0.42 ms
Suppression of interference, Limits of Error
Noise suppression for f = n (f1 " 1 %),
(f1 = interference frequency) n=1.2...
• Common-mode
interference
(U
CM
< 11 V
SS
)
> 80 dB
• 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)
• Voltage input " 1 V " 0.3 %
" 5 V " 0.4 %
" 10 V " 0.3 %
1 to 5 V; " 0.4 %
• Current input " 20 mA " 0.3 %
0 to 20 mA; " 0.3 %
4 to 20 mA: " 0.3 %