Signal Board 4 DI

Siemens 6ES7221-3BD30-0XB0 is a digital input signal board designed for use with the SIMATIC S7-1200 programmable logic controller (PLC). It provides four high-speed, current-sourcing digital input channels directly on the CPU, enabling flexible system expansion for automation and control applications.

Key Features

• Type: Signal Board SB 1221, Digital Input (DI)

• Number of Inputs: 4

• Input Type: 24 V DC, current-sourcing

• Input Voltage:

  • Rated Value: 24 V DC

  • Signal "0": (L+ minus 5.0 V DC) to L+ (1.4–0 mA)

  • Signal "1": 0 V to (L+ minus 10 V DC) (10–2.9 mA)

• Input Current:

  • Signal "0": Max. 1.4 mA (permissible quiescent current)

  • Signal "1": Min. 2.9 mA, typical 7 mA

• Input Delay: Parameterizable (0.1/0.2/0.4/0.8/1.6/3.2/6.4/10.0/12.8/20.0 µs or 0.05/0.1/0.2/0.4/0.8/1.6/3.2/6.4/10.0/12.8/20.0 ms)

• Input Characteristic: IEC 61131, Type 2 (current-sourcing)

• Switching Frequency: Up to 200 kHz

• Interrupts: Parameterizable for standard, interrupt, and technological functions

• Diagnostics: Diagnostics indication LED for input status

• Cable Length: Shielded, max. 50 m (twisted pair)

• Power Supply: From backplane bus: 5 V DC, typical 40–50 mA

• Power Loss: Typical 1 W

• Operating Temperature: -20°C to +60°C (horizontal), -20°C to +50°C (vertical)

• Storage Temperature: -40°C to +70°C

• Relative Humidity: Up to 95% at 25°C (non-condensing)

• Protection: IP20

• Dimensions: 38 mm (width) × 62 mm (height) × 21 mm (depth)

• Weight: Approx. 35–40 g

• Certifications: CE, CSA, UL, cULus, FM, RCM, KC, Marine