Product Description
6ES7221-1BH22-0XA8 Parameters
Product Details
| Parameter | Details |
|---|---|
| Manufacturer | Siemens |
| Model/Part Number | 6ES7221-1BH22-0XA8 |
| Description | SIMATIC S7-200 Digital Input EM 221 |
Product Overview
| Parameter | Details |
|---|---|
| Part Number | 6ES7221-1BH22-0XA8 |
| Product Name | EM 221 Digital Input Module |
| Application | High-density digital input expansion for S7-200 series PLCs in industrial automation, machine control, and process systems |
| Compatibility | Only for S7-22X CPUs (CPU 221, 222, 224, 224XP, 226); integrates with SIMATIC S7-200 PLC systems |
| Function | Provides 16 digital inputs (24 V DC) with optical isolation, LED status indication, and fast input response |
Functional Specifications
| Parameter | Details |
|---|---|
| Input Channels | 16 digital inputs (2 groups of 8) |
| Input Type | 24 V DC, sinking or sourcing (IEC 61131-2 Type 1) |
| Nominal Input Voltage | 24 V DC |
| Input Voltage Range | 20.4 _ 28.8 V DC |
| Logic 1 (min) | 15 V DC |
| Logic 0 (max) | 5 V DC |
| Input Current | 4 mA typical per input @ 24 V DC |
| Input Delay | 0.2 _ 12.8 ms (selectable via software) |
| Isolation | 500 V AC (field to logic), group-to-group isolated |
| Isolation Groups | 2 groups (inputs 0_7 and 8_15) |
| LED Indicators | 16 green LEDs (one per input channel) |
| Cable Length | - 500 m (unshielded) - 1000 m (shielded) |
| Connection Type | Removable screw terminal block (20-pin) |
| Wire Size | 0.2 _ 2.5 mm² (14_22 AWG) |
| Update Rate | Synchronized with CPU scan cycle |
| Diagnostics | Input status, short-circuit, open-circuit (via LED and CPU) |
Electrical Specifications
| Parameter | Details |
|---|---|
| Power Supply (Backplane) | 5 V DC (from CPU) |
| Power Consumption (5 V) | 60 mA |
| Power Consumption (24 V) | 15 mA (from external supply, if used) |
| Inrush Current | 1.5 A @ 5 V |
| External Power | Optional 24 V DC sensor supply via terminals |
Mechanical & Environmental Specifications
| Parameter | Details |
|---|---|
| Dimensions (H x W x D) | 80 mm _ 40 mm _ 62 mm |
| Weight | 0.12 kg |
| Mounting | Snap-on to S7-200 DIN rail |
| Housing Material | Plastic (UL94-V0) |
| Color | Light gray |
| Operating Temperature Range | 0°C to +60°C |
| Storage Temperature Range | -40°C to +70°C |
| Humidity | 5% to 95% non-condensing |
| Vibration | IEC 60068-2-6 (5g, 10_150 Hz) |
| Shock | IEC 60068-2-27 (30g, 11 ms) |
| Protection Rating | IP20 |
Configuration & Software
| Parameter | Details |
|---|---|
| Configuration Tool | STEP 7-Micro/WIN (V4.0 SP9 or higher) |
| I/O Addressing | Automatically assigned by CPU (next available input byte) |
| Parameterization | Input filter time, interrupt enable (on rising/falling edge) |
| High-Speed Input Support | Up to 30 kHz on select inputs (depends on CPU) |