Analog modules
6.8 Analog input module SM 331; AI 2 x 12 bit; (6ES7331-7KB02-0AB0)
S7-300 Automation System Module data
6-66 Manual, 08/2006, A5E00105505-04
Caution
If you have set the measuring range module to the "current" setting and voltage is being
interrogated, the module is destroyed!
Technical data
Technical data
Dimensions and weight
Dimensions W x H x D (mm) 40 x 125 x 117
Weight approx. 250 g
Module-specific data
Isochronous mode supported No
Number of inputs
• with resistive transducers
2
1
Cable length
• shielded
max. 200 m
max. 50 m at 80 mV and with thermocouples
Voltages, currents, electrical potentials
Rated electronics supply voltage L +
• Reverse polarity protection
24 VDC
Yes
Transducer power supply
• Supply current
• short circuit-proof
max. 60 mA (per channel)
Yes
Constant current for resistive transducers typ. 1.67 mA
Electrical isolation
• between channels and the backplane bus
• between channels and electronics power supply
– not for 2-wire transducers
Yes
Yes
Permissible potential difference
• between inputs and M
ANA
(CMV)
– at signal = 0 V
• between inputs (C
MV
)
• between M
ANA
and M
internal
(V
iso
)
typ. DC 2.5 V (> DC 2.3V)
typ. DC 2.5V (> DC 2.3V)
75 VDC / 60 VAC
Isolation test voltage 500 VDC
Current consumption
• from the backplane bus
• from load voltage L+
max. 50 mA
max. 30 mA (without 2-wire transducer)
Power loss of the module typ. 1.3 W
Formation of analog values
Measuring principle Integrating
Integration/conversion time/resolution (per channel)
• programmable
Yes
• Integration time in ms
2,5 16
2
/
3
20 100
• Basic conversion time, including the integration time in ms
6 34 44 204
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