Product Description:

Beckhoff manufactures the ER3174-0002, part of the ER EtherCAT Box Modules series. The compact I/O station is a rugged, field-mounted unit that brings EtherCAT signals out of the cabinet and directly into the machine environment. By combining an integrated bus coupler with sealed connectors, the module allows sensors and actuators to be connected on the network without additional enclosures. In an automation line, it serves as a decentralized interface that forwards digital data and power between controllers and devices while tolerating harsh ambient conditions.

The two network ports use 2 x M8 sockets, 4-pin, which simplifies daisy-chaining along the EtherCAT trunk. Signal traffic runs through CAT5 media and four dedicated conductors, helping maintain low propagation delay for distributed sub-millisecond cycles. A galvanic barrier of 500 V between the fieldbus and I/O channels isolates the controller from machine-level transients. Operating voltage is 24 VDC, and the internal supply can source up to 4 A, so downstream boxes can be powered without separate feeds. With Auto MDI-X support, either straight-through or crossover cables may be connected without manual selection. The enclosure carries an IP65/IP66/IP67 rating, meaning it blocks dust ingress and withstands high-pressure water jets from any direction.

A corrosion-resistant die-cast zinc housing shields the electronics and provides thermal mass for temperature stability. Torque settings of 0.6 Nm on the M12 thread and 0.4 Nm on the M8 thread help prevent seal damage while maintaining vibration resistance. Because the installation position is variable, the module can be fastened to vertical, horizontal, or inverted surfaces near the process. A 4-pin M8 socket on the output side relays auxiliary power to the next node, allowing power to pass through to adjacent modules. This layout supports decentralized I/O placement close to sensors and actuators while keeping the network connection protected in exposed machine areas.