Product details
Siemens 6ES7221-1BH32-0XB0 — SM1221 Digital Input Module
The Siemens 6ES7221-1BH32-0XB0 SM1221 is a 16-channel digital input module designed for the S7-1200 PLC system. It supports both sink and source wiring, offering flexible signal control and strong environmental resistance. Authored by Powergear X Automation.
Compact Power, Flexible Control
- 16 digital inputs at 24 V DC for precise signal detection.
- Compatible with both sink and source configurations.
- Low input current of only 4 mA per channel for energy savings.
- Supports long cable lengths — up to 500 m shielded.
- Diagnostic LEDs show live input status for faster troubleshooting.
Key Technical Details
- Model: 6ES7221-1BH32-0XB0
- Type: SM1221 16x24V DC Digital Input
- Rated supply voltage: 24 V DC (20.4–28.8 V range)
- Input delay: adjustable between 0.2 ms and 12.8 ms
- Power loss: 2.5 W (typical)
- Dimensions: 45 mm × 100 mm × 75 mm
- Weight: approx. 210 g
- Protection rating: IP20
Performance & Durability
- Operates reliably between -20°C and +60°C.
- CE, UL, CSA, FM, KC, and Marine approvals.
- High humidity tolerance up to 95% at 25°C.
- Resists vibration and drops up to 0.3 m during handling.
- Plastic front housing ensures lightweight and corrosion resistance.
Advantages for Automation
- Ideal for compact control panels and distributed I/O setups.
- Quick installation using standard front connector.
- Stable operation even in low voltage conditions down to 20.4 V DC.
- Parameterizable delay time supports flexible input response control.
- Supports mixed mounting positions with no performance loss up to 50°C.
Shipping & Warranty
- 12-month limited warranty from Powergear X Automation.
- Global shipping available via FedEx, UPS, and DHL.
- Each unit packaged with anti-static protection for safe transport.
Professional FAQ
- Q: Can the module detect fast pulse signals?
A: Yes, set the shortest delay time (0.2 ms) for high-speed detection. - Q: How can I wire this module in sink mode?
A: Connect the negative side of the load voltage (M) to the PLC input reference terminal. - Q: What happens if voltage drops below 20 V DC?
A: Inputs may become unstable. Maintain the rated 24 V DC for best accuracy. - Q: Can I mix this input module with analog modules on the same rail?
A: Yes, the S7-1200 backplane supports mixed module configurations. - Q: How often should I inspect terminal connections?
A: Check terminal screws every six months to prevent loose contacts in high-vibration areas.
Contact & Support
- Email: sales@powergearx.com
- WhatsApp: +86 18030005825
- Author: Powergear X Automation
Original Source: https://www.powergearx.com/
Copyright © 2025 Powergear X Automation Limited. All rights reserved.
There are no reviews yet.