Omron C200H-OD21A IO Expansion Module extends the input/output capacity of a C200H PLC system, enabling additional I/O to support larger or more complex automation setups. It is used with the Omron C200H family to expand the controller's reach in applications requiring more sensors, actuators, or signaling. The OD21A part number identifies this specific expansion option within Omron's Series C200H IO modules.
