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Siemens SIPLUS S7-1200 SM 1221 Digital Input Module (8DI)

Siemens SIPLUS S7-1200 SM 1221 Digital Input Module

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ManufacturerSiemens

Part number6AG1221-1BF30-4XB0

Module Type Digital Input

System SIMATIC S7-1200

Inputs 8 DI

Voltage 24V DC

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12-month warranty

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Veteran-owned

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8 x 24V DC digital inputs Sink or source configuration Conformal coating for harsh environments Wide operating temperature range (0-55 °C) SIPLUS enhanced protection Based on standard SM 1221

Product description

The Siemens SIPLUS S7-1200 SM 1221 (6AG1221-1BF30-4XB0) is a digital input module for the SIMATIC S7-1200 PLC system. It is based on the standard 6ES7221-1BF30-0XB0 but features enhanced environmental protection with conformal coating, making it suitable for operation in harsh conditions from 0 to +55 °C. This module provides 8 digital inputs that operate at 24V DC and can be configured as either sink or source inputs.

This SIPLUS module is ideal for industrial applications that require reliable digital signal acquisition in challenging environments. These include industries such as chemical processing, food and beverage production, marine applications, and outdoor control systems where moisture, dust, or corrosive elements are present. The conformal coating ensures long-term reliability and performance under these adverse conditions.

Stanlo Automation, a veteran-owned surplus distributor, offers the Siemens SIPLUS S7-1200 SM 1221 module. We are committed to providing quality industrial automation components. Choose Stanlo for your demanding automation projects and benefit from our expertise and service.

Technical specifications

Module Type	Digital Input
System	SIMATIC S7-1200
Inputs	8 DI
Voltage	24V DC
Configuration	Sink/Source
Environmental	Conformal Coating, 0 to +55 °C
Base Part	6ES7221-1BF30-0XB0

Common applications

Chemical plants

Food and beverage industry

Marine applications

Outdoor control cabinets

Harsh industrial environments

Process automation

Compatible systems

Siemens SIMATIC S7-1200 PLCs

Also known as

SIPLUS SM 1221, Siemens 8DI Module, 6AG1221 module, S7-1200 digital input

Replaces / compatible with

This is an enhanced version of the standard 6ES7221-1BF30-0XB0 module, offering superior environmental protection. It is a direct replacement for the standard module where increased environmental resilience is required.

Technical note

Expert tip

The sink/source configuration of the digital inputs must be correctly set in the PLC program to match the wiring of the field devices.

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Frequently asked questions

What is the advantage of the SIPLUS version (6AG1221-1BF30-4XB0) over the standard S7-1200 SM 1221 module?

The SIPLUS 6AG1221-1BF30-4XB0 features a conformal coating and is rated for a wider temperature range (0-55 °C), providing enhanced protection against moisture, dust, and corrosive elements, making it ideal for harsh industrial environments.