Siemens 6ES7 321-1BH02-0AA0 is a high-performance digital input module from the SIMATIC S7-300 series, designed specifically for the industrial automation field. It has a 16 channel 24V DC input capability and is widely used to connect standard switches, two-wire proximity switches (BERO), sensors, and other equipment. The input voltage range of this module covers 24V DC (signal "0" corresponds to -30 to+5V, signal "1" corresponds to 13 to 30V), with a typical input current value of 7mA (when signal "1"). It also supports optoelectronic isolation technology, which achieves potential isolation between the channel and the backplane bus through optocouplers, significantly improving anti-interference ability. Its technical parameters include: power supply voltage of 24V DC (allowable range 20.4-28.8V DC), input current from the backplane bus 5V DC (maximum 10mA), typical power loss of 3.5W, input delay of 1.2-4.8ms, wire length of up to 1000m when shielded and 600m when unshielded. The module size is compact (40 × 125 × 120mm), weighs about 200g, supports front connector wiring and hot plug function, and is easy to maintain on site.

This module is widely used in automation control systems in industries such as pharmaceuticals, food and beverage, automotive manufacturing, and chemical engineering to expand input/output channels and meet high reliability and stability requirements. Its advantages include compatibility with S7-300 series PLC and ET 200M distributed I/O devices, support for SIPLUS extreme environment adaptation, LED status display and fault diagnosis functions, and the ability to configure parameters and update firmware through STEP 7 software. In addition, the module also supports the HART communication protocol (in safe mode), which is suitable for the process control field. Users have evaluated its strong anti-interference ability and stable operation, which can significantly improve production line efficiency and equipment reliability. It is a key component for achieving precise data acquisition and control in industrial automation projects.

Input characteristics:

This module has 16 channels of 24V DC input, and the input voltage range complies with IEC 61131 standard, type 1. Signal '0' corresponds to -30 to+5V, signal '1' corresponds to 13 to 30V, and the typical input current value is 7mA (when signal '1'). The input delay time is 1.2ms to 4.8ms, supporting fast signal response.
Electrical specifications:

The power supply voltage is 24V DC, with an allowable range of 20.4 to 28.8V DC. The input current comes from the backplane bus 5V DC, with a maximum value of 10mA. The typical power consumption is 3.5W, suitable for high-performance demand scenarios.
Isolation and anti-interference:

Using optocouplers to achieve potential isolation between the channel and backplane bus, with an insulation test voltage of 500V DC, effectively improving anti-interference ability and system safety.
Physical and environmental parameters:

The module size is 40 × 125 × 120mm, weighing approximately 200g, and supports DIN rail installation. The working temperature range is 0 to 55 ° C (up to 60 ° C in some scenarios), with a protection level of IP20, suitable for various industrial environments.
Connection and compatibility:

Supports 20 pin front connector wiring, compatible with Siemens S7-300 series PLC and ET 200M distributed I/O devices. Hot swappable, easy to maintain on site, and supports SIPLUS extreme environment adaptation.
Communication and Scalability:

Supports PROFIBUS/PROFINET communication protocol and can seamlessly integrate with Siemens inverters, CPU modules, switches, touch screens, and other devices to build efficient automation systems.
Application scenarios:

Widely used in industries such as pharmaceuticals, food and beverage, automotive manufacturing, and chemical engineering, it is used for production line equipment control, process monitoring, and safety interlocking to improve production efficiency and system stability.
User reviews:

User feedback shows that it has strong anti-interference ability and stable operation, which can significantly reduce the failure rate and improve the system response speed. It is a key component for achieving precise data acquisition and control in industrial automation projects.

Our Services:

1,All our products are new and orginal, and of good quality

2,Our prices are very competitive.

3, We have a large quantity in stock, so we could help the customers to get the components which are dificult to get.

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Packing & Delivery:

1,100% brand New and Original Factory Seal!

2,Warranty:1 year

3,Package: Original packing with cartons.

4,Delivery time: Shipped in 3-7 days after payment

5,All the goods will be tested before shipment