Product Overview

Product Description for E-commerce
The Siemens 6ES7221-1BF32-0XB0 is a SIMATIC S7-1200 digital input expansion module (SM 1221) designed to extend the input capability of Siemens PLC systems. It provides 8 digital inputs operating at 24 V DC, allowing the controller to receive signals from field devices such as sensors, switches, push buttons, and relays.
This module integrates seamlessly with SIMATIC S7-1200 PLC controllers, enabling flexible system expansion for industrial automation projects. It supports sink/source wiring configuration, making it compatible with various industrial sensors and control circuits.
The compact DIN-rail mounted design ensures easy installation inside industrial control panels, making it ideal for machine automation, water treatment plants, pump control panels, and SCADA systems.

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Key Features
Compatible with SIMATIC S7-1200 PLC series
8 Digital Inputs (DI)
Input voltage: 24 V DC
Sink/Source input configuration
LED indicators for input status
Compact DIN rail mounting design
Reliable operation in industrial environments
Easy configuration through TIA Portal

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Technical Specifications

Parameter	Specification
Product Type	Digital Input Module
Model	SM 1221
Order Number	6ES7221-1BF32-0XB0
Compatible PLC	SIMATIC S7-1200
Digital Inputs	8 DI
Input Voltage	24 V DC
Input Current	approx. 4 mA per channel
Supply Voltage Range	20.4 – 28.8 V DC
Protection Class	IP20
Operating Temperature	−20°C to +60°C
Mounting	DIN Rail
Dimensions	45 × 100 × 75 mm
Net Weight	~0.15 kg

S7-1200 PLC CPU Model Name,	Description,	Siemens Part Number        (Order Code)

CPU 1211C  DC/DC/DC

Entry-level compact PLC with integrated I/O

6ES7211-1AE40-0XB0

CPU 1211C AC/DC/Relay

AC supply, relay outputs variant

6ES7211-1BE40-0XB0

CPU 1211C DC/DC/Relay

DC power, relay outputs

6ES7211-1HE40-0XB0

CPU 1212C DC/DC/DC

Standard performance compact PLC

6ES7212-1AE40-0XB0

CPU 1212C AC/DC/Relay

AC version with relay outputs

6ES7212-1BE40-0XB0

CPU 1212C DC/DC/Relay

DC power with relay outputs

6ES7212-1HE40-0XB0

CPU 1214C DC/DC/DC

Mid-range compact CPU

6ES7214-1AG40-0XB0

CPU 1214C AC/DC/Relay

Mid-range CPU with AC/relay outputs

6ES7214-1BG40-0XB0

CPU 1214C DC/DC/Relay

Mid-range DC with relay outputs

6ES7214-1HG40-0XB0

CPU 1215C DC/DC/DC

Higher-performance CPU

6ES7215-1AG40-0XB0

CPU 1215C AC/DC/Relay

Higher performance with AC/relay

6ES7215-1BG40-0XB0

CPU 1215C DC/DC/Relay

Higher performance DC with relay

6ES7215-1HG40-0XB0

CPU 1217C DC/DC/DC

Top performance compact CPU

6ES7217-1AG40-0XB0