
- Brand: Siemens
- Model: SIMATIC S7-1200 SM 1221 DC
- Type: Digital Input Module (DI 16 x 24 V DC)
- Part number: 6ES7221-1BH32-0XB0
- Technical specs:
- Supply voltage: Rated input voltage: 24 V DC | Permissible voltage range: 0...28.8 V DC (Continuous max: 30 V DC)
- Temperature: -20...60 °C horizontal installation; -20...50 °C vertical installation
- Current Rating: Nominal input current: 4 mA per channel
- Short-circuit Protection: No
- Overload Protection: No
- Reverse Polarity Protection: Yes
- Function: Captures digital 24V DC binary signals from industrial field devices such as pushbuttons, limit switches, proximity sensors, and optical barriers, routing them to the CPU memory map
- Power loss typical: 2.5 W
- Input filter delay parameterisable per channel group: 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, or 12.8 ms (default: 6.4 ms)
- Input frequency max: 100 kHz
- Rated shielding cable lengths: 500 m (shielded) / 300 m (unshielded)
- Connection type: Removable screw terminal blocks
- Housing material: Industrial thermoplastic polymer
- Mounting type: Side-by-side snap-on connection to the right side of an S7-1200 CPU or adjacent module on a standard 35mm DIN rail
- Protection rating: IP 20
- Status indication: 1 x Green LED (DIAG/Module status), 16 x Green LEDs
Weight: 200 g
Dimensions: 45 x 100 x 75 mm
Country of origin: China
HS Code: 8538.90.91
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