The Siemens SIMATIC S7-1200 SM 1221 digital input module, model 6ES7221-1BF32-0XB0, is a reliable and cost-effective solution for expanding I/O capacity in compact automation systems. Designed for high-speed signal acquisition, this module accepts 8 digital inputs at 24 V DC, with sink/source flexibility to match diverse field device requirements. Its robust electrical isolation and EMC protection ensure stable operation even in harsh industrial settings. Ideal for applications like conveyor monitoring, machine status sensing, or safety interlocks, the 6ES7221-1BF32-0XB0 integrates effortlessly with the S7-1200 ecosystem via the backplane bus, requiring no additional wiring for communication.
| Parameter |
Specification |
| Product Type |
Digital Input Module (SM 1221) |
| Model Number |
6ES7221-1BF32-0XB0 |
| Number of Inputs |
8 (Digital) |
| Input Voltage Type |
24 V DC (20.4 to 28.8 V DC) |
| Input Current per Channel |
Typical 4 mA at 24 V DC |
| Input Type |
Sink/Source (IEC Type 1 and 3 compliant) |
| Input Delay |
Hardware filter: 0.1 ms to 3.2 ms (configurable) |
| Isolation |
500 V AC between channels and backplane bus |
| Power Consumption from Backplane Bus |
Typical 1.5 W |
| Operating Temperature |
-20 °C to +60 °C |
| Storage Temperature |
-40 °C to +85 °C |
| Relative Humidity |
Up to 95% (non-condensing) |
| Protection Class |
IP20 (with enclosure) |
| Dimensions (W x H x D) |
45 mm x 100 mm x 75 mm |
| Weight |
Approx. 150 g |
| Mounting Method |
DIN rail (35 mm) or direct panel mounting |
| Connection Method |
Front connector (screw-type or push-in, sold separately) |
| Compatible CPU |
Siemens S7-1200 series (all CPU versions) |
| Standards |
IEC 61131-2, EN 50178, UL 508 |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
Original and fast!
2020/02/22