The JMC.ECT is an EtherCAT bus coupler designed to work with JMC1616 expansion modules, supporting up to 16 groups of modules and enabling up to 256 digital inputs/outputs. It features dual RJ45 interfaces with a transmission rate of 100Mb/s and a distance of 100m, with electrical isolation for millisecond-level fast response and stable high-speed data transmission. The device adopts a single isolated power supply solution with a power consumption of only 10mA (excluding external IO), and supports setting the number of expansion modules via DIP switches, suitable for signal monitoring and precise equipment control in industrial automation production lines.