| 摘要 |
A programmable logic controller system has: an input unit system section in which plural input units are combined; a CPU unit system section in which plural CPU units are combined; and an output unit system section in which plural output units are combined. Each system section has: a setting retaining unit to retain a setting indicating whether to use any of the plural units alone or use the plural units in a multiplexed manner; and a comparing unit to make a comparison of processed data between the plural units when the setting indicates using the plural units in a multiplexed manner, to send the processed data if the comparison result indicates consistency, and to perform an error process if the comparison result indicates inconsistency. In the setting retaining unit, whether to use alone or in a multiplexed manner is set based on an externally-input setting instruction. |
