Product Description
Key Features
- Digital input capacity: EM 221 module with 8 digital inputs and isolated inputs.
- AC input voltage: Input voltage is AC, with a rated value of 230 V; 220/230 V AC (47 Hz to 63 Hz).
- Input signal thresholds: Signal "0": up to 20 V AC; signal "1": 79V AC or more.
- Isolation and connection: Digital inputs have potential separation by optocoupler, in 8 groups of 1; plug-in I/O terminals are provided.
- Cable and sensor support: Supports 2-wire sensors with permissible quiescent current of 1 mA max.; cable length is 500 m max. shielded or 300 m max. unshielded.
- Physical and lifecycle data: Dimensions are 71.2 mm × 80 mm × 62 mm, weight is approx. 160 g, and product lifecycle is start of final year of support.
Technical Summary
| Product identity | SIMATIC S7-200 EM 221 digital input module, 6ES7221-1EF22-0XA0 |
|---|---|
| Digital inputs | 8 |
| Input voltage | 220/230 V AC (47 Hz to 63 Hz) |
| Signal "0" | up to 20 V AC |
| Signal "1" | 79V AC or more |
| Potential separation | Yes; Optocoupler, in 8 groups of 1 |
| Connection method | Plug-in I/O terminals |
| 2-wire sensor | Yes; permissible quiescent current 1 mA max. |
| Product lifecycle | Start of final year of support |
Frequently Asked Questions
What is the exact Siemens order number?
The exact order number is 6ES7221-1EF22-0XA0.
How many digital inputs does this EM 221 module have?
It has 8 digital inputs.
What input voltage does the module use?
The input voltage is AC, rated at 230 V; 220/230 V AC (47 Hz to 63 Hz).
Which connection method is provided?
The module has plug-in I/O terminals.
