Overview
The Siemens 6ES7221-3BD30-0XB0 is a compact digital input module designed for the SIMATIC S7-1200 programmable logic controller. This 4-channel input module processes 24V DC signals from sensors, switches, and field devices with fast response times suitable for high-speed applications. Built for reliability in demanding industrial environments, it integrates seamlessly into S7-1200 systems using the standard signal board interface.
Key Features
- 4 digital inputs (DI) configurable per application
- 24V DC sourcing input specification
- Fast input response: 200 kHz filtering capability
- Input current: 7 mA per signal
- Wide input voltage tolerance: 0–28.8V DC
- Compact form factor: 38 × 62 × 21 mm
- Direct signal board mounting to S7-1200 CPU
Technical Specifications
- Supply Voltage: 24V DC
- Number of Inputs: 4 digital inputs
- Input Type: Sourcing (PNP)
- Input Voltage Range: 0–28.8V DC
- Input Current per Channel: 7 mA at signal “1”
- Input Frequency: 200 kHz
- Signal Delay: 0.0025 ms
- Width: 38 mm
- Height: 62 mm
- Depth: 21 mm
- Configurable Inputs: Yes
- Series: SIMATIC S7-1200
- Part Number: 6ES7221-3BD30-0XB0
Typical Applications
- Manufacturing equipment control and monitoring
- Sensor input capture from proximity switches, limit switches, and photoelectric sensors
- Industrial process automation and machine control
- Discrete signal collection in packaged machine systems
- Integration with SCADA and MES systems via S7-1200 CPU
Compatibility & Replacements
Compatible With
- Siemens SIMATIC S7-1200 CPUs (all variants)
- TIA Portal (SCL, Ladder, Function Block programming)
- PROFINET communication via S7-1200 gateway
- Modbus TCP via Ethernet module (where configured)
- Standard 24V DC field power supplies and sensors
Replaces / Drop-In Replacement For
- Siemens 6ES7221-1BF30-0XB0 (verify with system integrator for exact application fit)
Works With
- Siemens TIA Portal v14 and later
- Siemens S7-1200 series controllers
- 24V DC PNP sensors and switches
- Standard industrial signal boards and terminals
