How many Remote IO drops does an M580 PLC support?

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M580 CPU                      |        Max Remote I/O Drops
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BME P58 2040                |              8
BME P58 3040                |              16
BME P(H)58 4040 |            16
BME P(H)58 5040 |            31
BME P(H)58 6040 | 31
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A "Rack" is defined as a backplane which holds devices.
A "Drop" is defined as the rack which are connected to CPU as a node on the RIO network.
A Drop can contain multiple racks by use of the BMXXBE Rack Extenders.