R660 – DP820 Pulse Counter RS-422 Description Description R660 – DP820 Pulse Counter RS-422 2 ch bidirectional pulse counters and frequency measurement, current, 5V, (12v), 24V. 1,5MHz Rated isol 50V Use Module Termination Unit TU810, TU812, TU814, TU830, TU833. Related products ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE088386R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE053241R1 Read more ABB - 1.3 800xA 6.1 Hardware (3BSE088708/E)3BSE072270R1 Read more