Product Description

The EJ8905 from Beckhoff is designed to facilitate signal distribution in control and automation applications using EtherCAT plug-in modules. Because it is small, the EJ8905 fits perfectly with other Beckhoff units to make sure that EtherCAT communication in industrial automation works well and is reliable.

The EJ8905 EtherCAT plug-in uses a 4-layer PCB with a normal thickness of 1.6 mm ± 10%, to make sure that the structure is strong and that it works at its best. For accurate EtherCAT signaling, the differential impedance of LVDS lines is kept at 100 Ω, and grounding through SGND mounting bolts provides strong shielding connections. Modules must be mounted on a control cabinet with precise spacing between them to prevent signal interference and ensure proper airflow. Differential E-bus signals are run on the inner PCB layers to keep EMC problems to a minimum. These signals are protected by SGND copper fills that lower electromagnetic interference. The series also follows routing rules that say to stay away from vias in differential pairs and keep three times the distance between differential pairs to keep signals clear and crosstalk to a minimum.

The E-bus runs at 3.3 V and powers the EtherCAT plug-in separately, and field-side electronics are powered separately to keep them from interfering with each other. For extra EMC security, shielding connections are grounded with metal bolts. The EJ8905 modules can distribute power and make high-reliability links. They are often used with the EJ1101 and EJ2889 to get more out of them. For physical installation, there should be 4 mm of space between the component and the mounting surface and 92 mm of space for servicing access. We ship all over the world and guarantee that all of our products will be fixed or replaced within a year.