6ES7221-1BF22-0XA0 Overview

The SIEMENS S7-200 6ES7221-1BF22-0XA0 is an EM 221 digital input module for the S7-200 series. It provides 8 optically isolated, 24V DC inputs compatible with sinking or sourcing sensors. Designed for S7-22X CPUs, it supports shielded cable runs up to 500 meters for reliable signal acquisition.

Features and Benefits

Module Identity: It is an EM 221 digital input module for the SIMATIC S7-200 series, compatible only with S7-22X CPUs.

Input Channels: Provides 8 digital input channels for 24V DC signals.

Wiring Flexibility: Inputs support both sinking (PNP) and sourcing (NPN) sensor wiring configurations.

Isolation & Protection: Features optical isolation (optocouplers) for electrical protection, grouped by 4 channels.

Signal Specifications: Recognizes 0-5V as "0" and +15 to +30V as "1", with a typical "1" signal current of 4mA.

Physical & Connectivity: Compact dimensions (46x80x62mm) with plug-in terminals, supporting shielded cables up to 500m for long-distance wiring.

FAQ

Q1: How many digital input channels does the Siemens 6ES7221-1BF22-0XA0 module have?

A1: It provides 8 digital input channels for 24V DC signals.

Q2: What types of sensors can be connected to this module?

A2: It supports both sinking (NPN) and sourcing (PNP) type sensors, offering wiring flexibility.

Q3: What is the signal voltage range for a valid "logic 1" input?

A3: A valid "logic 1" signal is defined as a voltage between +15V and +30V DC.

Q4: Does the module offer protection against electrical interference?

A4: Yes, it features optical isolation (optocouplers) for electrical protection between the field inputs and the backplane.

Q5: How long of a cable run can be used with this input module?

A5: It supports shielded cable runs up to a maximum of 500 meters and unshielded cable runs up to 300 meters.