Siemens 6ES5544-3UA11 is a CP544 Communication Processor Module for SIMATIC S5 PLCs, delivering a high-speed point-to-point serial link between an S5 CPU and remote devices. It provides two plug-in interface submodule slots that support TTY connections (20 mA current loop) and V.24/V.28 RS-232C or RS-422/485 interfaces, plus a dedicated TTY interface for a programming device and a slot for a 374 memory card. This CP544 module is compatible with S5 CPUs such as the 115U/H, 135U, and 155U/H families, enabling fast serial communications within legacy SIMATIC S5 installations.
