EJ1957-0000 Beckhoff
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The EJ1957-0000 is an EtherCAT plugin module from Beckhoff's EJ EtherCAT Plugins series. It offers eight inputs, four outputs, and eight clock outputs, with diagnostic coverage rated at 98.4% and a performance level of PL e. The module features a safety category 4, type 3 input characteristics, and a status display with 12 LEDs.
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Product Description:
The EJ1957-0000 is a safety-rated digital I/O plugin produced by Beckhoff for the EJ EtherCAT Plugins series. Intended for direct soldering onto a carrier board, the module equips compact machinery with fail-safe signal processing so that emergency stops, light curtains, and other protective devices can be connected without additional wiring effort. Inside an EtherCAT segment, it operates as a Safety over EtherCAT slave, providing deterministic exchange of safety data alongside standard process information.
The module offers diagnostic coverage of 98.4%, a figure that quantifies how completely internal faults are detected by its self-monitoring circuitry. A dedicated diagnostic display with 4 LEDs reports internal voltage, run, error, and communication states at a glance. For field signals, there are 8 safe inputs that follow the Type 3 characteristics of EN 61131-2, allowing direct connection of switches or PNP sensors. Actuation tasks are handled by 4 safety outputs that can source 24 V DC to contactors or indicator lamps, while time-critical synchronization signals are provided by 8 clock outputs for test pulses on connected channels. A hardware fault tolerance of 1 means the unit can tolerate a single failure without losing its safety function, and a status display with 12 LEDs visualizes channel states separately from the diagnostic section.
The safety chain attains Performance Level PL e and meets Safety Category 4, ensuring compatibility with applications that demand the highest risk reduction. A mean time to dangerous failure of 1731 a supports long service life, and the proof test interval is not required because automatic diagnostics cover latent faults. Probabilistic metrics, PFDavg of 5.0×10⁻⁵ and PFHD of 4.43×10⁻⁹, confirm the low likelihood of undetected failures. Overall housing size is 12 × 152 × 55 mm, allowing high-density mounting next to other EJ plugins without exceeding standard card spacing. The narrow housing leaves room for neighboring plugins on densely populated carrier boards, and the input circuitry maintains reliable signal recognition over the full supply range.
