6ES5525-3UA21 Siemens SIMATIC S5 CP525 Communication Processor

6ES5525-3UA21 belongs to Siemens SIMATIC S5 series CP525 intelligent communication processor, Eurocard plug-in module with dual TTY / RS232C interfaces and memory submodule slot. It runs S5-DOS operating system to handle independent data communication tasks for S5 PLC rack, exchanging data with host computers, printers and programming terminals, widely used in legacy chemical, power and printing automation system maintenance and spare replacement.