The Beckhoff EL4001 is a digital input module for a programmable logic controller (PLC) from Beckhoff Automation. It is part of the ELxxxx series of I/O modules designed to be used with Beckhoff's TwinCAT automation software.

The EL4001 module is used to interface with digital input signals in automation applications. It provides four channels for connecting 24 V DC digital signals to the PLC system. Each channel can be individually configured as either a sinking or sourcing input.

The EL4001 supports fast signal processing with a response time of 20 µs per channel. It also offers diagnostic information, allowing you to monitor the status of input channels, check for wire breakage, and detect short circuits.

To use the EL4001 module, you need a compatible Beckhoff PLC system and programming environment, such as TwinCAT. The module can be mounted on a DIN rail or integrated into a Beckhoff control cabinet.

When configuring the module in your PLC program, you will need to assign input variables to the appropriate channels of the EL4001. These variables will reflect the states of the connected digital signals and can be used in your PLC logic for controlling your automation system.

Overall, the Beckhoff EL4001 is a versatile digital input module that provides reliable and fast digital signal acquisition for PLC-based automation systems.