SIMATIC S7-400, analog input SM 431, 8 AI

About SIMATIC S7-400, analog input SM 431, 8 AI

 SIMATIC S7-400, Analog Input SM 431The SIMATIC S7-400 Analog Input SM 431 is an 8-channel analog input module for the S7-400 series. It features: - 8 analog input channels- High-resolution input signals- Galvanic isolation for reliable operation- Compact design for space-saving installation Key Specifications: - Input type: Analog- Number of channels: 8- Isolation: Galvanic- Compatibility: S7-400 series 

SIMATIC S7-400 Analog Input Module SM 431

Article No.: 6ES7431-1KF20-0AB0
Type: Isolated 8 AI, 14-bit resolution

Supply Voltage

• Load Voltage L+: 24 V DC (only required for 2-wire transmitters)

• Reverse Polarity Protection: Yes

• Input Current:

  • From L+ (without load, max): 200 mA (for 8 fully controlled 2-wire transmitters)

  • From Backplane Bus 5 V DC, max: 1,000 mA

• Power Loss (Typ.): 4.9 W

Analog Inputs

• Number of Inputs: 8

  • Voltage/Current: 8

  • Resistance: 4

• Permissible Input Voltage (destruction limit): 18 V continuous, 75 V for 1 ms

• Permissible Input Current (destruction limit): 40 mA

• Constant Measurement Current for Resistance Transmitters: 1.67 mA

Input Ranges

Voltage:

• 1 5 V, Input resistance: 10 M

• -1 +1 V, Input resistance: 10 M

• -10 +10 V, Input resistance: 100 k

Current:

• -20 +20 mA, Input resistance: 50

• 4 20 mA, Input resistance: 50

Resistance:

• 0 600

• Cable Length: Shielded, max. 200 m

Analog Value Generation

• Resolution (including sign): 14-bit

• Integration Time: Parameterizable

• Basic Conversion Time per Channel: 52 s

• Module Execution Time (all channels): 0.416 ms

• Time Constant of Input Filter: 15 s

• Interference Voltage Suppression: None / 400 / 60 / 50 Hz

Encoder / Transducer Support

• Voltage measurement: Yes

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

• Resistance measurement: 2-wire, 3-wire, 4-wire: Yes (line resistances measured in 2- & 3-wire)

Accuracy & Errors

• Temperature Error: 0.03 %/K

• Operational Error Limit:

  • Voltage: 0.7 % (1 V), 0.9 % (10 V), 1 5 V

  • Current: 0.8 % (-20 +20 mA, 4 20 mA)

  • Resistance: 1 % (0 600 )

• Basic Error Limit (25 C):

  • Voltage: 0.6 % (1 V), 0.75 % (10 V), 1 5 V

  • Current: 0.7 %

  • Resistance: 0.7 %

Diagnostics / Status

• Diagnostics Function: No

Isolation / Potential Separation

• Analog Inputs: Internal/external separation

• Between Channels: No

• Between Channels & Backplane Bus: Yes

• Between Channels & Load Voltage L+: Yes

• Isolation Tested:

  • Bus Analog Section: 2,120 V DC

  • Bus Local Ground: 500 V DC

  • Analog Section L+/M: 500 V DC

  • Analog Section Local Ground: 2,120 V DC

  • L+/M Local Ground: 2,120 V DC

Dimensions & Weight

• Width: 25 mm

• Height: 290 mm

• Depth: 210 mm

• Weight: 500 g 

Technical Details