Analog Modules
4-79
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Wiring of the module for measuring current
Current measurements are made by paralleling a channel’s voltage input terminals
with its respective current sense resistor. This is accomplished by jumpering the
channels input terminals to the adjacent terminals on the field connector.
Example: To configure channel 0 for current mode, you must jumper terminal 22 to
2 and terminal 23 to 3.
The channel being configured for current measurements must be paired with the
sense resistor connected to the channel’s adjacent terminals in order to achieve
the specified accuracy.
Technical specifications of the SM 331; AI 8 x 16 bits
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
Isolation
• Between channels and
backplane bus
Yes
Permitted potential difference
• Between the inputs
(ECM)
50 VDC, 35 VAC
• Between M
ANA
and
M
internal
(U
ISO
)
75 VDC / 60 VAC
Insulation tested with 500 VDC
Current consumption
• From the backplane bus max. 130 mA
Power dissipation of the
module
typically 0.6 W
Analog value generation
Measuring principle Integrating
Integration time/conversion
time/ resolution (per channel)
• Parameters can be
assigned
Yes
• Integration time in
milliseconds
10 16.7 20 100
• Basic conversion time
per channel group
when more than one
channel group is
active
35 55 65 305
• Channel conversion
time per channel
group if only channel
group 0 or 1 is
enabled
10 16.7 20 100
Channel integration time
(1/f1)
in ms
10 16.7 20 100
• Resolution including
sign
15 bits + sign
• Suppression of
interference voltage for
interference frequency f1
in Hertz
100 60 50 10
Basic execution time of the
module, in ms (all channels
enabled)
140 220 260 1220
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