Abstract: An expansion unit includes a connector to which a remote unit is connected, an embedded memory that records therein information in a nonvolatile manner, an external memory I/F into which a memory card is inserted, a CPU that performs reading of the operation information set in the remote unit connected via the connector and performs writing of the operation information into the remote unit connected via the connector, and a memory switching switch that sets a writing destination of the operation information read from the remote unit connected to the connector and a reading source of the operation information to be written into the remote unit connected to the connector to any one of the memory card inserted into the external memory I/F and the embedded memory.

Abstract: An expansion unit includes a connector to which a remote unit is connected, an embedded memory that records therein information in a nonvolatile manner, an external memory I/F into which a memory card is inserted, a CPU that performs reading of the operation information set in the remote unit connected via the connector and performs writing of the operation information into the remote unit connected via the connector, and a memory switching switch that sets a writing destination of the operation information read from the remote unit connected to the connector and a reading source of the operation information to be written into the remote unit connected to the connector to any one of the memory card inserted into the external memory I/F and the embedded memory.

Abstract: An analog input unit configured to be included in a programmable controller and to sequentially convert analog values input from outside into digital values, the analog input unit includes: an analog-to-digital conversion unit that converts an analog value being a measurement value of a flow meter into a digital value; a flow computation unit that calculates an instantaneous flow and a total integrated flow that is obtained by integrating a flow per setting time set in advance, based on the digital value from the analog-to-digital conversion unit; and a storage unit that includes a flow storage area for storing therein the instantaneous flow and the total integrated flow calculated by the flow computation unit.