About SIEMENS PLC SM331 6ES7331-7HF01-0AB0

SIMATIC S7-300, Analog input SM 331, isolated, 8 AI, resolution 14 bit, 0.052 ms/channel current, Voltage alarm, diagnostics, 1x 20-pole, suitable for isochronous mode Improved bus cycle time for isochronous mode. 

Data Sheet 6ES7331-7HF01-0AB0

SIMATIC S7-300 | Analog Input Module SM 331 (Isolated) 8 AI | 14-bit resolution | 0.052 ms/channel | Voltage Alarm |Diagnostics Connector: 1 20-pole | Suitable for Isochronous Mode

Supply Voltage

• Load voltage L+ (DC): 24 V

• Reverse polarity protection: Yes

Input Current

• From load voltage L+ (without load), max.: 50 mA

• From backplane bus 5 V DC, max.: 100 mA

Power Loss

• Typical: 1.5 W

Analog Inputs

• Number of inputs: 8

• Max permissible input voltage: 20 V DC permanent, 75 V DC for max. 1 s (1:20 duty factor)

• Max permissible input current: 40 mA

Input Ranges

Voltage Inputs

Current Inputs

Thermocouple / RTD / Resistance

• Not supported

Cable Length

• Shielded, max.: 200 m

Analog Value Generation

• Resolution (with overrange): Max 14-bit

  • Unipolar: 14 bit

  • Bipolar: 13 bit + sign

• Integration time: Parameterizable

• Basic conversion time: 52 s per channel

• Interference suppression (f1 Hz): none / 400 / 60 / 50

Encoder Connection

• 2-wire current transmitter: Yes

• 4-wire current transmitter: Yes

Error / Accuracy

Operational Error (Full Temperature Range)

• Voltage: 0.4 %

• Current: 0.3 %

Basic Error (at 25 C)

• Voltage: 0.25 %

• Current: 0.2 %

Diagnostics / Status

• Diagnostics function: Yes

• Diagnostic alarm: Yes, parameterizable

• Limit value alarm: Yes, parameterizable (channels 0 & 2)

• Diagnostic info readable: Yes

• LED: Group error SF (red): Yes

Isolation / Potential Separation

• Between channels: No

• Between channels and backplane bus: Yes

• Between channels and power supply of electronics: Yes

• Isolation tested: 500 V DC

Connection Method

• Required front connector: 20-pin

Dimensions & Weight

• Width: 40 mm

• Height: 125 mm

• Depth: 117 mm

• Weight: Approx. 230 g 

Technical Details