Siemens 6ES7221-1BH32-0XB0 – SIMATIC S7-1200 Digital Input SM 1221, 16 DI, In Stock
Buy the Siemens 6ES7221-1BH32-0XB0, a SIMATIC S7-1200 digital input signal module SM 1221 with 16 sink/source digital inputs, 24 V DC. In stock and ready for fast shipping. Get a quote today.
Key Technical Specifications
- Product Type: SM 1221, DI 16×24 V DC
- Number of Digital Inputs: 16, grouped in 4s
- Input Type: Sink/Source, IEC 61131 Type 1 characteristic curve
- Supply Voltage: 24 V DC (20.4–28.8 V permissible range)
- Input Current: 4 mA typical for signal “1”
- Backplane Bus Current: 130 mA max from 5 V DC bus
- Power Loss: 2.5 W typical
- Diagnostic Alarm: Yes, with status LEDs per input
- Potential Separation: Between channels, in groups of 4
- Protection Rating: IP20
- Ambient Temperature: -20 °C to 60 °C (operation)
- Dimensions (W x H x D): 45 x 100 x 75 mm
- Weight: Approx. 210 g
Design and Performance
Flexible Expansion for the S7-1200
As a signal module, the SM 1221 expands the digital input count of any SIMATIC S7-1200 CPU (except CPU 1211C), allowing the system configuration to be adapted precisely to application requirements without oversizing the CPU.
Sink/Source Input Flexibility
Configurable sink or source wiring on all 16 inputs, with a rated 24 V DC input voltage, gives designers flexibility to match the module to existing field-device wiring conventions.
Diagnostics and Fast Response
Diagnostic alarm capability combined with per-input status LEDs provides quick visibility into input states and simplifies troubleshooting, while parameterizable input delay (0.2 ms to 12.8 ms) allows the response time to be tuned to the application.
Compact, Space-Saving Design
A slim 45 mm width lets multiple modules be mounted side-by-side on a DIN rail, conserving control cabinet space while expanding I/O capacity.
Rugged Industrial Certification
Rated IP20 with a wide -20 °C to 60 °C operating range, and certified to CE, UL, cULus, CSA, FM, RCM, and KC standards for global industrial deployment.
Why Buy the 6ES7221-1BH32-0XB0 From Us
- In stock and ready for immediate dispatch
- Fast shipping on every order
- Commercial advisory support to help you confirm compatibility with your SIMATIC S7-1200 CPU
- Competitive pricing — get a quote in minutes
