Description
The SIMATIC S7-1200 SM 1221 is a Digital Input (DI) signal module for the SIMATIC S7-1200 programmable logic controller (PLC) system. The model 6ES7221-1BH32-0XB0 specifically provides 8 digital inputs for connecting field devices like pushbuttons, switches, and proximity sensors. It is designed for reliable acquisition of 24V DC binary control signals in industrial automation applications, and features diagnostic LEDs for easy troubleshooting.
Key Features
- Module Type: Digital Input (DI) Module for S7-1200 PLC
- Input Channels: 8 channels, 24V DC sink/source
- Connection: Single-wire connection (1-wire sensor connection)
- Diagnostics: Channel status LEDs (green) and module error LED (red)
- Electrical Isolation: Channel-to-channel and field side to logic side isolation
- Power Budget: Low power consumption from the S7-1200 backplane
- Configuration: Automatic address assignment via TIA Portal software
- Mounting: Snap-on mounting on DIN rail
Technical Specifications
- Supply Voltage: From S7-1200 CPU via system bus
- Input Voltage (Rated): 24V DC (20.4V to 28.8V DC)
- Number of Inputs: 8
- Input Type: Sink/Source (IEC Type 1 & 3)
- Nominal Input Current: Typically 4 mA at 24V DC
- “1” Signal Level: 15V to 30V DC
- “0” Signal Level: -3V to 5V DC
- Input Delay (Programmable): 0.1 ms, 0.8 ms, 1.6 ms, 3.2 ms, 12.8 ms
- Connection Type: Removable front connector
- Dimensions (WxHxD): 45 mm x 100 mm x 75 mm
- Weight: Approx. 200 g
- Protection Class: IP20
- Standards: CE, cULus, UL, IEC, RoHS compliant
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for configuration and installation
- Wiring assistance
- Compatibility verification with S7-1200 systems
- Commissioning and diagnostics support available
Delivery Time
- Standard delivery: 3-5 working days
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SIMATIC components
- Global supply network with competitive pricing
- Expertise in industrial automation and Siemens PLC systems
- Comprehensive technical documentation
- Responsive customer service and support
Applications
- Connecting pushbuttons, selector switches, and control devices
- Reading signals from 2-/3-wire proximity sensors (PNP/NPN)
- Interfacing with limit switches and photoelectric sensors
- General-purpose binary signal acquisition in machines and plants
- S7-1200 system expansion for increased I/O capacity
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