Analog-to-digital converting device and control system

An analog-to-digital converting device comprising:

• a main analog-to-digital converter configured to convert an analog signal, which is output from a sensor and input to the analog-to-digital converting device, to a digital signal;
• and
• one or more microcomputers configured to monitor the digital signal converted by the main analog-to-digital converter,
• wherein
• the main analog-to-digital converter is provided by an analog-to-digital conversion purpose integrated circuit arranged separately from the one or more microcomputers that monitor the main analog-to-digital converter,
• the one or more microcomputers include:
• a plurality of sub analog-to-digital converters each of which having a conversion accuracy lower than a conversion accuracy of the main analog-to-digital converter and converting the analog signal, which is output from the sensor and input to the analog-to-digital converting device, to a digital signal;
• a setting unit setting a predetermined threshold based on conversion values of the digital signals converted by the plurality of sub analog-to-digital converters;
• and
• a comparing unit comparing a conversion value of the digital signal converted by the main analog-to-digital converter with the predetermined threshold set by the setting unit, and
• the analog-to-digital converting device is applied to a control system that controls an industrial equipment as a control target.