ANALOG INPUT UNIT AND PROGRAMMABLE CONTROLLER

摘要

An analog input unit, which is provided in a programmable controller and serially converts externally-input analog values into digital values, includes: an analog-digital converter (120) that converts the analog values, as measured by a flow meter, into digital values; a flow calculation unit (131) that calculates an instantaneous flow as well as a total integrated flow that integrates the flow rate for a preset set time on the basis of the digital values from the analog-digital converter; and a storage unit (140) comprising a flow storage area (143) that stores the instantaneous flow and the total integrated flow calculated by the flow calculation unit.