The Beckhoff EL1904 is a 4-channel digital input terminal for the EtherCAT I/O system. Based on the Beckhoff naming convention, the "EL" prefix indicates an EtherCAT terminal, and "1904" identifies the digital input function and channel configuration. It provides 24 V DC digital input acquisition for field devices, connected to the EtherCAT network via the terminal bus.
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