16 X 24VDC SIMATIC S7-1200 PLC 6ES7221-1BH32-0XB0 SM 1221 DI

SIMATIC S7-1200 PLC 6ES7221-1BH32-0XB0 SM 1221 DI 16x24 V DC

I. Product Description:

The SIMATIC 6ES7221-1BH32-0XB0 is a digital input expansion module for the SIMATIC SIMATIC S7-1200 series, model SM 1221 DI 16x24 V DC. It is used to add additional digital input points to the S7-1200 PLC for acquiring 24 V DC signals from field devices such as pushbuttons, switches, and proximity switches

16 digital input channels

Rated voltage: 24 V DC

Input delay time adjustable from 0.2 ms to 12.8 ms

Input channels are grouped in sets of four and isolated from one another, enhancing the system’s immunity to interference

: Maximum current drawn from the backplane bus (5 V DC) is 130 mA; typical power consumption is 2.5 W

II. Product Specifications:

SIMATIC 6ES7221-1BH32-0XB0｜SIMATIC S7-1200 SM 1221 Digital Input Module

Permitted Input Voltage Range: 20.4 to 28.8 V DC;
Input Type: Sink/source;
Input Characteristic: IEC 61131-2 Type 1;
Signal "0" Input Voltage: -30 to 5 V DC;
Signal "1" Input Voltage: 15 to 30 V DC;
Input Current at Signal "1": Approximately 4 mA;
Input Delay: Approximately 3.2 ms;
High-Speed Inputs: Supported;
High-Speed Counter Functions: Supported according to CPU and system configuration;
Input Frequency: Up to 100 kHz for compatible high-speed functions;
Channel Grouping: Inputs arranged in groups for system integration;
Electrical Isolation: Inputs electrically isolated from the backplane bus;
Hardware Interrupts: Supported;
Diagnostic Functions: Module and input diagnostics supported;
Status Indication: LED indication for input status;
Power Supply: 24 V DC supplied through the S7-1200 system;
Backplane Bus Current Consumption: Approximately 80 mA at 5 V DC;
Typical Power Loss: Approximately 1.5 W;
Engineering Software: STEP 7 / TIA Portal;
Configuration: Parameterizable through the TIA Portal engineering environment;
System Compatibility: SIMATIC S7-1200 automation systems;
Mounting: Direct mounting to the right side of a compatible S7-1200 CPU or signal module;
Protection Rating: IP20;
Operating Temperature: -20 to 60 °C;
Storage / Transport Temperature: -40 to 70 °C;
Maximum Relative Humidity: 95% at 25 °C, non-condensing;
Maximum Cable Length: Up to 500 m for shielded cables and up to 300 m for unshielded cables;
Dimensions (W × H × D): Approximately 45 × 100 × 75 mm;
Net Weight: Approximately 0.148 kg;
Typical Applications: Digital sensor signal acquisition, switch monitoring, proximity sensor interfaces, machine automation, conveyor systems, packaging equipment, production lines, and industrial automation systems based on the SIMATIC S7-1200 

III. Technical Parameters:

SIMATIC S7-1200, Digital input SM 1221, 16 DI, 24 V DC, Sink/Source

IV. Industries Served:

The SIMATIC 6ES7221-1BH32-0XB0 is a basic expansion module for the S7-1200 system.

Light Industry and Packaging Machinery: such as packaging, filling, and labeling equipment

Machine Tools and Manufacturing Workshops: Used in machine tools, assembly lines, and various types of processing equipment

Material Handling Systems: Such as lifting and transport equipment, conveyor belt systems

Detects equipment status—including operation, position, and faults—by connecting to pushbuttons, limit switches, proximity switches, and other devices

Use this module for flexible expansion when the input points provided by the S7-1200 CPU unit are insufficient

V. Product certificates:

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