EJ3108 Beckhoff
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The Beckhoff EJ3108 is part of the EJ EtherCAT Plugins series and features 6 differential and 2 single-ended input channels with a 16-bit resolution. This polycarbonate module has a width of 12 mm, height of 66 mm, and depth of 55 mm, and operates with a process image width of 16 bytes. It is rated to a maximum operating altitude of 2000 meters and a protection rating of IP20.
Internal Product Review
The EJ3108 is a Beckhoff EJ EtherCAT plugin analog input module designed for precise industrial signal handling. Support for 6 differential plus 2 single-ended input channels paired with 16-bit resolution gives the module strong flexibility and clean measurement detail. An IP20 protection rating and 1 ms minimum cycle time make the EJ3108 a very capable choice for fast, dependable control cabinet integration.
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Product Description:
The EJ3108 is an analog input plug-in module produced by Beckhoff as part of the EJ EtherCAT Plugins series. By snapping into a carrier board alongside other EJ I/O, the unit brings field-level measurement signals onto the EtherCAT real-time network without separate wiring. In typical machine automation, it samples differential or single-ended voltages and forwards digitized data to the controller through the integrated E-bus backplane. This layout keeps signal handling close to the I/O assembly and supports compact control hardware.
Its physical footprint is limited to 12 mm in width, 55 mm in depth, and 66 mm in height, so multiple channels fit on the carrier without using excessive cabinet space. The housing is molded from polycarbonate and matches the series' compact plug-in form factor while providing basic insulation. Signal acquisition is handled by 6 differential + 2 single-ended voltage inputs converted at 16 bit resolution, which helps retain amplitude detail for control algorithms. A deterministic scan is possible because the EtherCAT device supports a minimum cycle time of 1 ms and is powered exclusively from the E-bus, eliminating separate supply wiring. A coding pin set to positions 1 and 5 prevents accidental interchange with neighboring modules, and reliable operation is permitted up to an altitude of 2000 m.
The process data image occupies 16 bytes, which lets the PLC read all channel values and status bits in a single bus cycle. Cable runs between the carrier board and field sensors can extend up to 30 m, staying within the transmission limits for low-level voltages while keeping the system topology flexible. Electrical insulation withstands common-mode shifts of ±8 V max, and the module follows the series' IP20 protection rating for use in closed control cabinets. These operating characteristics suit measurement tasks that need compact installation and direct EtherCAT integration.
