Programmable Logic Controller Guide: Selection, Application, and Maintenance for Engineers
PLC selection guide for engineers covering IEC 61131 compliance, Siemens, Rockwell, Schneider, ABB comparison, scan time sizing, and wiring. Shop at Stoklink.
- Part number
- 6ES7221-3BF50-0XB0
- Model no
- SB 1221, DI 8x 24 V DC 100 kHz
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· From Türkiye
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SIMATIC S7-1200Siemens 6ES7221-3BF50-0XB0 SIMATIC S7-1200 SB 1221 8DI 24VDC 100kHz Digital Input Signal Board
SIMATIC S7-1200 SB 1221 signal board, 8 DI, 24V DC sink/source, 100 kHz HSC input.
Description
About the SB 1221, DI 8x 24 V DC 100 kHz
About the SB 1221, DI 8x 24 V DC 100 kHz
The Siemens 6ES7221-3BF50-0XB0 SIMATIC S7-1200 SB 1221 signal board adds 8 sink/source digital inputs at 24 V DC to a compact CPU, with a 100 kHz high-speed counting input option. It draws 108 mA from the backplane bus, dissipates 2.4 W, and mounts directly onto the CPU front without extra rack space.
Certifications & Standards
- CE
- UL
- cULus
- RCM
- KC
Selection Notes
This SB 1221 variant delivers 8 sink/source inputs at up to 100 kHz; a shorter-channel-count sibling in the same signal board family instead runs 4 inputs at 200 kHz. Pick this 8-channel version when the application needs more input points than count channels, and the 4-channel version when raw edge-detection speed on fewer points matters more. Signal boards mount directly onto the S7-1200 CPU front, adding I/O without consuming a rack slot, unlike SM-series expansion modules. The 707 V DC isolation test between channels and backplane bus is a standard type test rating, not a safety-isolation barrier.
Applications
Adds digital sensing capacity to a single S7-1200 CPU without a rack slot: proximity sensor banks, limit switches, and pulse counting from encoders or flow meters up to 100 kHz per channel.
Specification
Full specification
General information 2
| Product type designation | SB 1221, DI 8x 24 V DC 100 kHz |
|---|---|
| Engineering with: STEP 7 TIA Portal configurable/integrated from version | V20 or higher |
Input current 2
| from backplane bus 5 V DC, typ. | 108 mA |
|---|---|
| Digital inputs: from load voltage L+ (without load), max. | 6 mA; per channel |
Power loss 1
| Power loss, typ. | 2.4 W |
|---|
Show all 84 specifications ↓ Show less ↑79 more values in Identification, Digital inputs, Interrupts/diagnostics/status information, Potential separation, Degree and class of protection, Standards, approvals, certificates, Ambient conditions, Mechanics/material, Dimensions, Weights, Approvals / Certificates, General Product Approval EMV, For use in hazardous locations Test Certificates, Logistics.
Identification 10
| Part number | 6ES7221-3BF50-0XB0 |
|---|---|
| Type designation | SB 1221, DI 8x 24 V DC 100 kHz |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4047623417187 |
| ETIM class | EC001419 |
| eCl@ss | 27242204 |
Digital inputs 13
| Number of digital inputs | 8; sink / source |
|---|---|
| in groups of | 8 |
| Input characteristic curve in accordance with IEC 61131, type 1 | Yes |
| Number of simultaneously controllable inputs all mounting positions: up to 40 °C, max. | 8 |
| Input voltage: Rated value (DC) | 24 V |
| Input voltage: for signal "0" | 5 V DC or 0.5 mA |
| Input voltage: for signal "1" | 15 V DC at 2.5 mA |
| Input current: for signal "0", max. (permissible quiescent current) | 0.5 mA |
| Input current: for signal "1", min. | 3.3 mA |
| Input current: for signal "1", typ. | 6 mA |
| Input delay (for rated value of input voltage) for standard inputs: parameterizable for interrupt inputs | Yes; 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 μs; 0.05 / 0.1 / 0.2 / 0.4 / 0.8 / 1.6 / 3.2 / 6.4 / 10.0 / 12.8 / 20.0 ms |
| Cable length: shielded, max. | 500 m; 500 m shielded, 50 m shielded for HSC inputs |
| Cable length: unshielded, max. | 300 m |
Interrupts/diagnostics/status information 5
| Diagnostics function | Yes |
|---|---|
| Alarms: Diagnostic alarm | No |
| Diagnoses: Monitoring the supply voltage | No |
| Diagnostics indication LED: DIAG LED | Yes |
| Diagnostics indication LED: for status of the inputs | Yes |
Potential separation 4
| Potential separation digital inputs: between the channels | No |
|---|---|
| Potential separation digital inputs: between the channels, in groups of | 8 |
| Potential separation digital inputs: Number of potential groups | 1 |
| Potential separation digital inputs: between the channels and backplane bus | Yes; 707 V DC (type test) |
Degree and class of protection 1
| IP degree of protection | IP20 |
|---|
Standards, approvals, certificates 14
| Siemens Eco Profile (SEP) | Siemens EcoTech |
|---|---|
| CE mark | Yes |
| CSA approval | No |
| UL approval | Yes |
| cULus | Yes |
| FM approval | No |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | No |
| Ecological footprint: environmental product declaration Global warming potential | Yes; type 2 acc. to ISO 14021 |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 9.53 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 3.86 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 5.74 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.086 kg |
Ambient conditions 17
| Free fall: Fall height, max. | 0.3 m; five times, in product package |
|---|---|
| Ambient temperature during operation: min. | -20 °C |
| Ambient temperature during operation: max. | 40 °C; at max. voltages and max. specifications |
| Ambient temperature during operation: horizontal installation, min. | -20 °C |
| Ambient temperature during operation: vertical installation, min. | -20 °C |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13: Operation, min. | 540 hPa |
| Air pressure acc. to IEC 60068-2-13: Operation, max. | 1 140 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, min. | 540 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, max. | 1 140 hPa |
| Altitude during operation relating to sea level: Installation altitude, min. | -1 000 m |
| Relative humidity: Operation at 25 ℃ without condensation, max. | 95 % |
| Vibrations: Vibration resistance during operation acc. to IEC 60068-2-6 | 3.5 mm from 5 - 8.4 Hz, 1g from 8.4 - 150 Hz |
| Vibrations: Operation, tested according to IEC 60068-2-6 | Yes |
| Shock testing: tested according to IEC 60068-2-27 | Yes; IEC 68, Part 2-27 half-sine: strength of the shock 15 g (peak value), duration 11 ms |
| Pollutant concentrations: SO2 at RH < 60% without condensation | S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60 % condensation-free |
Mechanics/material 1
| Enclosure material (front): Plastic | Yes |
|---|
Dimensions 3
| Width | 15 mm |
|---|---|
| Height | 62 mm |
| Depth | 63 mm |
Weights 1
| Weight, approx. | 26 g |
|---|
Approvals / Certificates 1
| General Product Approval | Miscellaneous |
|---|
General Product Approval EMV 1
| China RoHS Manufacturer Declara- | tion |
|---|
For use in hazardous locations Test Certificates 1
| Miscellaneous CCC-Ex CCC-Ex Type Test Certific- | ates/Test Report |
|---|
Logistics 7
| Net weight | 0.04 kg |
|---|---|
| Package dimensions | 82 × 34 × 79 mm |
| Country of origin | DE |
| Shipping weight | 0.54 kg |
| Ships from | Türkiye |
| Dispatch | 16 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7221-3BF50-0XB0
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Ask us for the datasheet
Certifications
Certifications and standards
- CE mark
- UL approval
- cULus
- RCM (formerly C-TICK)
- KC approval
Quick answers
Questions about the SB 1221, DI 8x 24 V DC 100 kHz
Which supply voltage is SB 1221, DI 8x 24 V DC 100 kHz rated for?
The rated operational voltage of SB 1221, DI 8x 24 V DC 100 kHz is 24 V AC.
What is the HS code of SB 1221, DI 8x 24 V DC 100 kHz for customs?
The tariff (HS) code on file for SB 1221, DI 8x 24 V DC 100 kHz is 85389091.
What is the EAN of SB 1221, DI 8x 24 V DC 100 kHz?
The EAN (GTIN) of SB 1221, DI 8x 24 V DC 100 kHz is 4047623417187.
Where does SB 1221, DI 8x 24 V DC 100 kHz ship from, and how fast?
SB 1221, DI 8x 24 V DC 100 kHz ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
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Series
Siemens SIMATIC S7-1200
- Brand
- Siemens
- Series
- SIMATIC S7-1200
