| 摘要 |
<p>PURPOSE:To obtain PC(programmable controller) which prevents dangerous operation due to a defect in maintenance of equipment and informs a user of equipment in trouble and its cause in case of abnormality occurrence. CONSTITUTION:A RAM 4 is stored with a main program, which is executed while the input signal of a RAM 7 is read out. When the arithmetic result is stored as an output signal in the RAM 7 and the output signal is transferred to the outside, a decision program stored in a RAM 8 is executed and if abnormality is confirmed, the corresponding basic message is selected in a RAM 11. Further, the name of the abnormal equipment is specified on the basis of the output signal of the abnormality and they are put together into an error message, which is outputted by a CPU 2 to a display device 20.</p> |
