Here are some key features of the Beckhoff EL4004 module:

Digital Inputs: The EL4004 module offers four isolated digital inputs. These inputs can handle both 24 V DC and 5 V DC signals, making it compatible with a wide range of devices.

Isolation: Each input channel of the EL4004 module is individually isolated, providing protection against electrical interference and ensuring reliable operation.

Input Signal Filtering: The module provides configurable input signal filtering to help eliminate noise and provide stable input readings.

Diagnostic LEDs: The EL4004 module includes diagnostic LEDs for each input channel, allowing for easy status monitoring during operation.

Connection: The module is connected to the Beckhoff PLC system via a standard Beckhoff Bus Terminal system, which provides a convenient and modular approach to expand the I/O capabilities of the PLC.

Configuration and Programming: The EL4004 module can be easily integrated and configured within the TwinCAT programming environment, which is a software platform provided by Beckhoff for PLC programming and configuration.