| 摘要 |
An analog input unit (3), which is an analog unit installed in a PLC (1), comprises: an A/D conversion unit (11), which is a first conversion means for carrying out conversions between analog values and digital values in accordance with a first conversion characteristic; a shared memory (13), which is a holding means for holding a conversion characteristic table (7) indicating a second conversion characteristic relating to conversions between pairs of digital values; and a conversion processing unit (6), which is a second conversion means which refers to the conversion characteristic table held by the holding means and converts digital values in accordance with the second conversion characteristic. The conversion characteristic table contains a number of combinations of a first value, which is a digital value, and a second value, which is the result when the first value is converted, where said number of combinations corresponds to the resolution of the digital values in the analog unit. The second value in each combination of a first value and a second value can be adjusted. |
