Product information
Overview
Key Features
- 8 isolated digital inputs: The EM 221 has 8 digital inputs with potential separation by optocoupler.
- AC input voltage: Rated input is 230 V; 220/230 V AC at 47 Hz to 63 Hz.
- Signal thresholds: Signal "0" is up to 20 V AC; signal "1" is 79V AC or more.
- Input response: The response time for standard inputs from "0" to "1" is max. 15 ms.
- Cable length: Maximum cable length is 500 m for shielded cables and 300 m for unshielded cables.
- Plug-in terminals: The module has plug-in I/O terminals and supports 2-wire sensors with max. permissible quiescent current of 1 mA.
Technical Summary
| Product type | SIMATIC S7-200 EM 221 digital input module |
|---|---|
| Digital inputs | 8 |
| Input voltage | 220/230 V AC (47 Hz to 63 Hz); rated value 230 V |
| Signal "0" | up to 20 V AC |
| Signal "1" | 79V AC or more |
| Potential separation | Yes; optocoupler, between channels in groups of 1; 8 groups |
| Connection method | Plug-in I/O terminals |
| Lifecycle | Start of final year of support |
Frequently Asked Questions
What input voltage does Siemens 6ES7221-1EF22-0XA0 use?
Its rated input value is 230 V; the specified range is 220/230 V AC at 47 Hz to 63 Hz.
How many isolated digital inputs does the EM 221 have?
It has 8 digital inputs with potential separation by optocoupler, in 8 groups of 1 between the channels.
What cable lengths are supported?
The maximum cable length is 500 m for shielded cables and 300 m for unshielded cables.
How is the module connected?
It uses plug-in I/O terminals and supports 2-wire sensors with max. permissible quiescent current of 1 mA.
