PLC device having variable resolution of temperature measurement

摘要

A PLC device of the invention includes an input part 11 that can be connected to a temperature sensor 30, which can output an voltage value depending on a temperature of an target object. A voltage amplifier 12 is connected to the input part 11. A switch 13 can be selectively connected to one of the input part 11 and the voltage amplifier 12 to be switched to one of a voltage value from the input part 11 and a voltage value from the voltage amplifier 12. An A-D converter 14 is connected to the switch 13 in such a manner that the one of the voltage value from the input part 11 and the voltage value from the voltage amplifier 12 is inputted to the A-D converter 14 and converted into a digital value by the A-D converter 14. A temperature obtaining part 15 is connected to the A-D converter 14 and can obtain a temperature of the target object from the converted digital value.