The ABB VBX01T and VBX01B are bus extenders for the ABB Symphony Plus SD I/O system. They are used to extend the reach of the SD I/O bus, allowing you to connect more I/O devices to your system.

The VBX01T is a top-mounted bus extender, while the VBX01B is a bottom-mounted bus extender. This means that the VBX01T connects to the top of an SD I/O column, while the VBX01B connects to the bottom.

Both the VBX01T and VBX01B have the following features:

• Support for up to 24 SD I/O modules
• A built-in 24 VDC power supply for the SD I/O modules
• A terminal block for connecting the SD I/O bus
• LEDs that indicate the status of the bus and the power supply

The VBX01T and VBX01B are a good choice for applications where you need to extend the reach of the SD I/O bus or add more I/O devices to your system. They are easy to install and use, and they provide a reliable connection for your SD I/O devices.

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