6ES7221-1BF32-0XB0 - Siemens SM 1221 DC
Siemens 6ES7221-1BF32-0XB0 is an SM 1221 digital input module with eight 24V DC inputs for S7-1200 PLC automation.
This Siemens module supports 8 digital inputs, 24 V DC rated voltage, sink/source input type, and IP20 protection with screw or spring clamp connectivity. It belongs to the Siemens PLC Controllers ecosystem under the SIMATIC S7-1200 I/O Modules series.
| Brand | Siemens |
| Product Type | PLC - Programmable logic Controller |
| Series | Simatic S7-1200 |
| SKU / MPN | 6ES7221-1BF32-0XB0 |
Siemens SM 1221 DC 6ES7221-1BF32-0XB0 Technical Specifications:
| Specification | Value |
|---|---|
| Product Description | SIMATIC S7-1200, Digital input SM 1221, 8 DI, 24 V DC, Sink/Source |
| Product Family | SM 1221 digital input modules |
| Product Lifecycle (PLM) | PM300:Active Product |
| Net Weight (kg) | 0,150 Kg |
| Packaging Dimension | 8,80 x 10,90 x 6,00 |
| Package Size Unit of Measure | CM |
| Country of Origin | Germany |
The 6ES7221-1BF32-0XB0 Siemens SM 1221 DC is a digital input extension module used with SIMATIC S7-1200 PLC systems. This module provides 8 digital inputs, operates at 24 V DC, follows IEC 61131 Type 1 sink/source logic, and maintains IP20 protection for control cabinet installations. It belongs to the SIMATIC S7-1200 series and supports reliable signal acquisition in industrial automation environments.
In industrial applications, the 6ES7221-1BF32-0XB0 Siemens SM 1221 DC module is commonly installed in conveyors, packaging machines, assembly lines, and automated production panels. It enables stable detection of digital signals from sensors, switches, and field devices. The defined electrical behavior and compact form factor help maintain consistent PLC input processing across distributed automation systems.
The Siemens 6ES7221-1BF32-0XB0 module combines structured digital input handling, compact dimensions, and standardized S7-1200 compatibility. Siemens PLC I/O modules are widely adopted for long-term availability and predictable system integration. The 6ES7221-1BF32-0XB0 Siemens SM 1221 DC remains suitable for industrial automation projects requiring dependable digital input acquisition within SIMATIC S7-1200 architectures.
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