The Siemens 6RX1700-0AK00 is the CUD2 (Communications Unit Digital 2) terminal expansion board for the SIMOREG DC-MASTER 6RA70 series DC drives. It is an optional plug-in module that mounts directly onto the base CUD1 control board (C98043-A7001) inside the drive electronics compartment, significantly expanding the drive's input/output and communication capabilities .
The CUD2 provides additional analog and digital I/O, a supplementary RS-485 interface, and a parallel interface for connecting multiple drives in a coordinated group. It is essential for applications requiring more control signals than the base CUD1 board can handle, and it is mandatory for parallel operation of multiple 6RA70 converters.
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