Siemens PLCs SIMATIC S7-300 input SM331 6ES7331-7PF01-0AB0 6ES7331-7PF11-0AB0

Supply voltage

Load voltage L+

• ● Rated value (DC)

24 V

24 V

24 V

24 V

• ● Reverse polarity protection

Yes

Yes

Yes

Yes

Input current

from load voltage L+ (without load), max.

240 mA

240 mA

150 mA

200 mA

from backplane bus 5 V DC, max.

100 mA

100 mA

100 mA

130 mA

100 mA

Power loss

Power loss, typ.

4.6 W

3 W

2.2 W

0.6 W

3 W

Analog inputs

Number of analog inputs

8

8

6

8

8

• ● For resistance measurement

8

permissible input voltage for voltage input (destruction limit), max.

75 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20)

75 V; 20 V DC permanent, 75 V DC for max. 1 s (duty factor 1:20)

35 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20)

50 V; Permanent

75 V; 35 V continuous, 75 V for max. 1 s (mark to space ratio 1:20)

permissible input current for current input (destruction limit), max.

32 mA

40 mA

Constant measurement current for resistance-type transmitter, typ.

0.7 mA

0.7 mA

Input ranges

• ● Voltage

No

No

Yes

Yes

Yes

• ● Current

No

No

No

Yes

Yes

• ● Thermocouple

No

Yes

Yes

No

No

• ● Resistance thermometer

Yes

No

No

No

No

• ● Resistance

Yes

No

No

No

No

Input ranges (rated values), voltages

• ● 0 to +10 V

No

No

No

No

No

• ● 1 V to 5 V

No

No

No

Yes

Yes

• — Input resistance (1 V to 5 V)

2 MΩ

10 MΩ

• ● 1 V to 10 V

No

No

No

No

No

• ● -1 V to +1 V

No

No

Yes

No

No

• — Input resistance (-1 V to +1 V)

10 MΩ

• ● -10 V to +10 V

No

No

No

Yes

Yes

• — Input resistance (-10 V to +10 V)

2 MΩ

10 MΩ

• ● -2.5 V to +2.5 V

No

No

No

No

No

• ● -250 mV to +250 mV

No

No

Yes

No

No

• — Input resistance (-250 mV to +250 mV)

10 MΩ

• ● -5 V to +5 V

No

No

No

Yes

Yes

• — Input resistance (-5 V to +5 V)

2 MΩ

10 MΩ

• ● -50 mV to +50 mV

No

No

Yes

No

No

• — Input resistance (-50 mV to +50 mV)

10 MΩ

• ● -500 mV to +500 mV

No

No

Yes

No

No

• — Input resistance (-500 mV to +500 mV)

10 MΩ

• ● -80 mV to +80 mV

No

No

Yes

No

No

• — Input resistance (-80 mV to +80 mV)

10 MΩ

Input ranges (rated values), currents

• ● 0 to 20 mA

No

No

No

Yes

Yes

• — Input resistance (0 to 20 mA)

250 Ω

250 Ω

• ● -10 mA to +10 mA

No

No

No

No

No

• ● -20 mA to +20 mA

No

No

No

Yes

Yes

• — Input resistance (-20 mA to +20 mA)

250 Ω

250 Ω

• ● -3.2 mA to +3.2 mA

No

No

No

No

No

• ● 4 mA to 20 mA

No

No

No

Yes

Yes

• — Input resistance (4 mA to 20 mA)

250 Ω

250 Ω