Siemens 6ES7197-1LB00-0XA0 Y-Coupler is a SIMATIC S7 module that creates a Y-Link for redundant controllers. It is a single-interface Y-coupler with an integrated RS-485 repeater and uses a star connection to link single-channel I/O to the H system, enabling reliable inter-controller communication in redundancy configurations. The unit consumes approximately 1 W of power from the SIMATIC bus.
