Quantum racks may be used in any locations of local, remote, or distributed I/O. There are six racks available in 2, 3, 4, 6, 10, and 16 slot versions.

The 140 XBE 100 00 Rack Expander provides the Modicon Quantum with the capacity to expand Local and Remote I/O drops to a second rack. For improved I/O capacity and efficiency, the rack expander will save money by minimizing the number of Remote I/O drops. The Rack Expander also improves the overall performance of Remote I/O based systems by reducing the number of Remote I/O drops the Quantum CPU has to service. The Rack Expander effectively doubles the maximum number of Discrete I/O that can be serviced by a Quantum Remote I/O system.