Analog modules
6.5 Analog input module SM 331; AI 8 x 14 Bit High Speed; synchronous; (6ES7331-7HF0x-0AB0)
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
6-31
Technical data
Voltages, currents, electrical potentials
Rated electronics supply voltage L +
• Reverse polarity protection
24 VDC
Yes
Transducer power supply
• Supply current
• short ciruit-proof
max. 30 mA (per channel)
Yes
Electrical isolation
• between channels and the backplane bus
• between channels
• between channels and electronics power supply
Yes
No
Yes
Permissible potential difference
• between inputs and M
ANA
(CMV)
– at signal = 0 V
– not for 2-wire transducers
• between inputs (CMV)
• between M
ANA
and M
internal
(V
iso
)
11 VDC / 8 VAC
11 VDC / 8 VAC
75 VDC / 60 VAC
Isolation test voltage
• Channels to backplane bus and load voltage L +
500 VDC
Current consumption
• from the backplane bus
• from load voltage L + (without 2-wire transducer)
max. 100 mA
max. 50 mA
Power loss of the module typ. 1.5 W
Formation of analog values
Measuring principle Actual value conversion
Integration/conversion time/resolution (per channel)
• programmable
Yes
• Basic conversion time per channel
52 µs
• Resolution (including overshoot range)
14 bits
• Noise suppression at interference frequency f1 in Hz
None 400 60 50
• Basic execution time of the module (independent of the
number of enabled channels)
0.42 ms 2.5 ms 16.7 ms 20 ms
Noise suppression, error limits
Noise suppression at f = n (f1 ± 1 %), (f1 = interference frequency) n=1.2...
• Common-mode interference (CMV < 11 Vpp)
• Seriesmode interference (peak value of disturbance <
rated input range)
> 80 dB
> 40 dB
Crosstalk between inputs > 65 dB
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