ABB PU517 RTA Board 3BSC980050R46.it uses to communicate with ABB AC450 Controller.The PU517 real time accelerator is the communication card inside a Unix workstation serving as the op station on Advant.It communicates to the MB300 propriority ethernet bus to the controller subsystems.If this card is missing or faulty, the OS500 application on the Unix will not come up.
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