Siemens 6ES7221-3BD30-0XB0 S7-1200 SB 1221 24V High-Speed Input Board
- Brand
- Siemens
- Model
- 6ES7221-3BD30-0XB0
- GEARWELL SKU
- GWP-000001818
- Category
- Industrial Automation Parts
Key specifications
- Dimensions (W × H × D)
- 38 × 62 × 21 mm (W × H × D)
- Rated digital input
- 24 V DC, nominal 7 mA per input; current-sourcing
- Maximum high-speed counting frequency
- 200 kHz single-phase; 160 kHz quadrature. Above 20 kHz, a square wave and suitable signal quality are required.
- Simultaneous-input temperature limits
- 4 inputs at 55 °C horizontal or 45 °C vertical; 2 nonadjacent inputs at 60 °C horizontal or 50 °C vertical
- Power loss — published values
- 1 W typical in Siemens article data; TIA system manual lists 1.5 W. Published figures differ; typical is not a guaranteed maximum. Confirm thermal sizing against the device documentation.
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← Back to productsProduct overview
The Siemens 6ES7221-3BD30-0XB0 SB 1221 is an S7-1200 signal board with four 24 V DC sourcing inputs. It supports counting up to 200 kHz in single-phase mode or 160 kHz in quadrature mode. Above 20 kHz, the input requires a square wave and appropriate signal quality; the frequency rating is not a guarantee for every cable installation. All four inputs may operate simultaneously at 55 °C horizontal or 45 °C vertical. At 60 °C horizontal or 50 °C vertical, only two nonadjacent inputs may be on together. The board measures 38 × 62 × 21 mm (width × height × depth).
Technical reference
| Product name | Siemens 6ES7221-3BD30-0XB0 S7-1200 SB 1221 24V High-Speed Input Board |
|---|---|
| Brand | Siemens |
| Model | 6ES7221-3BD30-0XB0 |
| Category | Industrial Automation Parts |
| Dimensions (W × H × D) | 38 × 62 × 21 mm (W × H × D) |
| Rated digital input | 24 V DC, nominal 7 mA per input; current-sourcing |
| Maximum high-speed counting frequency | 200 kHz single-phase; 160 kHz quadrature. Above 20 kHz, a square wave and suitable signal quality are required. |
| Simultaneous-input temperature limits | 4 inputs at 55 °C horizontal or 45 °C vertical; 2 nonadjacent inputs at 60 °C horizontal or 50 °C vertical |
| Power loss — published values | 1 W typical in Siemens article data; TIA system manual lists 1.5 W. Published figures differ; typical is not a guaranteed maximum. Confirm thermal sizing against the device documentation. |
| Dimensions — Depth | 21 mm |
| Product description | SIMATIC S7-1200, Digital input SB 1221, 4 DI, 24 V DC 200 kHz, Sourcing input |
| Weights — Weight, approx. | 35 g |
| Number of digital inputs | 4; Current-sourcing |
| Product type designation | SB 1221, DI 4x24 V DC 200 kHz |
| Operating temperature and input derating | -20…60 °C horizontal; -20…50 °C vertical. At 60/50 °C, at most 2 nonadjacent inputs on; all 4 require ≤55 °C horizontal or ≤45 °C vertical. |
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