About SIEMENS PLC MODULES 6ES7331-7KF02-0AB0

SIMATIC S7-300, Analog input SM 331, isolated, 8 AI, Resolution 9/12/14 bits, U/I/thermo couple/resistor, alarm, diagnostics, 1x 20-pole Removing/inserting with active back plane bus. 

Data Sheet 6ES7331-7KF02-0AB0

SIMATIC S7-300 | Analog Input Module SM 331 (Isolated)
8 AI | Voltage / Current / Thermocouple / RTD / Resistance | 9/12/14-bit Resolution

Supply Voltage

• Load voltage L+ (DC): 24 V

• Reverse polarity protection: Yes

Input Current

• From L+ (without load): 30 mA max

• From backplane bus (5 V DC): 50 mA max

Power Loss

• Typical: 1 W

Analog Inputs

• Total analog inputs: 8

• Resistance measurement channels: 4

• Destruction limits:

  • Voltage: 20 V continuous, 75 V max (1 s, 1:20 duty)

  • Current: 40 mA max

• Constant RTD excitation current: 1.67 mA (typ.)

Supported Input Types

• Voltage: Yes

• Current: Yes

• Thermocouple: Yes

• Resistance thermometer (RTD): Yes

• Resistance: Yes

Voltage Input Ranges

Current Input Ranges

Thermocouples Supported

Supported: E, J, K, L, N (all 10 M input resistance)
Not supported: B, C, R, S, T, U, TXK

Temperature Compensation:

• Parameterizable: Yes

• Internal: Yes

• External: Yes (with compensation socket)

• Custom reference temperature: Yes

RTD (Resistance Thermometer) Support

Not supported: Ni1000, Ni120, Pt1000, Pt200, Pt500, Cu10, etc.

Resistance Measurement

(06000 not supported)

Cable Length

• Shielded cable: max. 200 m

• At 80 mV & Tc: max. 50 m

Analog Value Processing

• Resolution:

  • Max: 15-bit including sign

  • Unipolar: 9/12/12/14 bit

  • Bipolar: 9/12/12/14 bit + sign

• Integration times: 2.5 / 16.67 / 20 / 100 ms (parameterizable)

• Conversion times: 3 / 17 / 22 / 102 ms

• Interference suppression: 400 / 60 / 50 / 10 Hz

Encoder Connections

• Voltage measurement: Yes

• Current measurement (2-wire & 4-wire): Yes

• Resistance measurement (2-wire, 3-wire, 4-wire): Yes

Accuracy

Operational Error (full temperature range)

• Voltage: 0.6% to 1%

• Current: 0.7%

• Resistance: 0.7%

• RTD (Pt100/Ni100): 0.7%

• Thermocouples (E, J, K, L, N): 1.1%

Basic Error at 25C

• Voltage: 0.40.7%

• Current: 0.5%

• Resistance: 0.5%

• RTD: 0.50.6%

• Thermocouple: 0.7%

Diagnostics & Alarms

• Diagnostics function: Yes

• Diagnostic alarm: Yes (channels 0 & 2)

• Limit value alarm: Yes

• Diagnostic info readable: Yes

LED Indicators:

• SF (red): Yes

Isolation

• Between channels: No

• Channels backplane bus: Yes

• Channels electronics supply: Yes

• Withstand voltage: 500 V DC

Connections

• Required front connector: 20-pin

Mechanical Data

• Width: 40 mm

• Height: 125 mm

• Depth: 117 mm

• Weight: 250 g (approx.) 

Technical Details