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Siemens 6ES7221-1BH32-0XB0 SM 1221 Digital Input Module

Siemens 6ES7221-1BH32-0XB0 SM 1221 Digital Input Module

Product Name: SM 1221 Digital Input Module

Brand Name: Siemens

Model Number: 6ES7221-1BH32-0XB0

Place of Origin: Germany

Warranty: 12 Months

Whatsapp：+86 18020776782

Email：[email protected]

Appurtenance:

siemens 6es7221 1bh32 0xb0 sm 1221 digital input module-1

Overview
Functions
Features
Contact Info
Commercial Terms
Parameter
Application Scenarios
Operating Environment
Recommended Products

Overview

The Siemens 6ES7221-1BH32-0XB0 is a digital input module designed for the SIMATIC S7-1200 automation system. It is used to acquire and convert external digital signals into internal PLC signals for processing within industrial control applications.

This module features 16 digital input channels and is designed for flexible integration into various machine and process automation systems, enabling reliable signal acquisition from field devices such as sensors, switches, and other digital sources.

Functions

Converts external 24V DC digital signals into PLC-readable internal signals
Provides 16-channel digital input acquisition
Supports sinking and sourcing input configurations
Interfaces field devices (sensors, switches, control signals) with the PLC system
Ensures reliable signal detection with defined switching thresholds

Features

16 Digital Input Channels
Provides 16 independent 24V DC digital input points for flexible signal acquisition in automation systems.
24V DC Industrial Signal Compatibility
Designed to work with standard industrial 24V DC sensors, switches, and field devices.
Sinking/Sourcing Flexibility
Supports both sinking and sourcing input configurations, enabling easy integration with different wiring standards.
Wide Input Voltage Range
Accepts low-level (0–5V DC) and high-level (15–30V DC) signals with clearly defined switching thresholds for reliable detection.
High Signal Stability
Built-in threshold design ensures accurate signal recognition and reduces false triggering in noisy environments.
Easy System Integration
Fully compatible with the SIMATIC S7-1200, allowing seamless expansion of PLC digital input capacity.
Industrial Robust Design
Engineered for continuous operation in demanding environments with electrical noise, vibration, and temperature variation.
Compact Modular Form Factor
Space-saving design suitable for DIN rail mounting inside standard control cabinets.

Contact Info

Sales	Email	Whatsapp
Jim Pei	[email protected]	+86 18020776782

Commercial Terms

Minimum Order Quantity	1 Piece
Price	Contact for Jim
Packaging Details	Original new Factory Sealed
Delivery Time	3–7 Days
Payment Terms	T/T
Shipping Method	DHL / FedEx / UPS / TNT
Supply Ability	In stock

Parameter

Product Name	Siemens 6ES7221-1BH32-0XB0 SM 1221 Digital Input Module
Manufacturer	Siemens
Product Type	SM 1221 Digital Input Module
Part Number	6ES7221-1BH32-0XB0
Estimated shipping dimensions	4.5x7.5x10cm
Weight	0.18 kg
Place of shipment	Xiamen, China
Country of origin	Germany
Product Family	Siemens Simatic S7-1200
Number of Input Channels	16
Input Type	Digital Input (DI)
Input Voltage Range	20.4V to 28.8V DC
Input Current	4mA per channel
Response Time	Less than 1ms
Protection Rating	IP20
Product type designation	SM 1221, DI 16x24 V DC
Rated value (DC)	24 V
from backplane bus 5 V DC, max.	130 mA
Power loss, typ.	2.5 W
Rated value (DC)	24 V
for signal	5 V DC at 1 mA
for signal	15 V DC at 2.5 mA

Application Scenarios

Machine automation signal acquisition
Sensor and limit switch monitoring
Conveyor and material handling systems
Production line status detection
Industrial process monitoring systems
Equipment safety and interlock signal collection

Operating Environment

The Siemens 6ES7221-1BH32-0XB0 digital input module is designed for installation in industrial control cabinets as part of the SIMATIC S7-1200 system. It is typically mounted on a DIN rail and operates using standard 24V DC field wiring, making it suitable for a wide range of factory automation setups.

The module is intended for use in electrically noisy and mechanically demanding industrial environments, such as manufacturing plants and automated production lines. It is built to maintain stable signal acquisition performance under conditions involving vibration, electrical interference, and continuous long-term operation.