The Siemens SIMATIC S7-200 EM 221 digital input module, model 6ES7221-1BF22-0XA0, is a field-proven expansion unit designed to extend the input capacity of S7-200 CPUs. This compact module features 8 isolated digital inputs, each accepting 24 V DC signals, making it suitable for monitoring sensors, switches, and other discrete devices in factory automation, building control, and process applications. Its plug-and-play connection via the S7-200 backplane bus ensures minimal installation effort, while integrated surge protection and LED diagnostics enhance system reliability. Whether used in standalone or networked configurations, the 6ES7221-1BF22-0XA0 delivers consistent performance in harsh industrial environments.
| Parameter |
Specification |
| Product Type |
Digital Input Expansion Module |
| Model Number |
6ES7221-1BF22-0XA0 |
| Series |
SIMATIC S7-200 |
| Number of Inputs |
8 (isolated) |
| Input Type |
24 V DC (sinking/sourcing) |
| Input Voltage Range |
20.4 V to 28.8 V DC |
| Input Current per Channel |
Typically 4 mA at 24 V DC |
| Input Delay |
0.2 ms to 12.8 ms (selectable) |
| Isolation |
Opto-isolated, 500 V AC for 1 minute |
| Backplane Bus Current Consumption |
Typically 30 mA from 5 V DC |
| Power Supply |
24 V DC (external, not from backplane) |
| Indicators |
Green LED per input for status |
| Connection Method |
Removable screw terminals (2-wire) |
| Operating Temperature Range |
0 °C to +55 °C (storage -40 °C to +70 °C) |
| Relative Humidity |
5% to 95% (non-condensing) |
| Dimensions (W x H x D) |
46 x 80 x 62 mm |
| Weight |
Approximately 0.12 kg |
| Compatible CPUs |
S7-200 CPU 22x series (e.g., CPU 221, 222, 224, 226) |
| Standards |
IEC 61131-2, UL 508, CE marked |
| Protection Class |
IP20 |
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