| 摘要 |
PURPOSE:To prevent an erroneous action from being generated repeatedly by displaying the generation of abnormality, stopping the action and controlling a load in a safe condition when a programmable control means runs away. CONSTITUTION:A first programmable control means CPU 1 to control a control object load, to monitor a power source signal, to identify the existence of power source interruption, moreover, to generate a pulse repeatedly and to impress it on a reset means 202 periodically and a second programmable control means CPU 2 of which an actuating condition is initialized by a reset signal are provided. Then, when the first programmable control means CPU 1 detects the power source interruption, the second programmable control means CPU 2 stores information in a storing means 205, identifies the existence of abnormality generation, when the abnormality exists, energizes the abnormality display means, impresses a stop signal on the first programmable control means CPU 1 and holds an action stop condition. Thus, an erroneous action can be prevented from being generated repeatedly. |
