| 摘要 |
<p>A programmable controller comprises an input portion (11) for receiving an input signal from an object of control and a processing unit (72) for performing processing under a control program. The processing unit (72) generates an input information holding signal at the beginning of each scanning cycle. The holding signal causes input holding means (10) interposed between the input portion (11) and the processing unit (72) to hold the input information. This scheme keeps the input information unchanged during each scanning cycle, thus improving the reliability of processing through prevention of processing errors. <IMAGE></p> |
