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The Epson RC180 and RC620+ Controllers come standard with 24 Inputs and 16 Outputs. However, many applications require additional I/O to allow the controller to interact with peripheral devices like conveyors, feeders, tooling, etc. For this reason Epson has the Expansion I/O Option. Up to 4 Expansion I/O boards can be added to the Epson RC Controllers. Once installed, the controller will recognize the additional I/O and allow access to it through the SPEL+ I/O commands, as well as the Epson RC+ I/O Monitor.Important: To add Expansion I/O to the RC180 Controller, an Option Unit (option I/O board carrier) is required. Up to 2 option boards can be installed inside 1 Option Unit.