摘要 |
<p>PURPOSE:To effect protection during interruption of service with the use of a simple construction by timely store in an outside memory the data which are necessary to be retained even during the interruption of service. CONSTITUTION:A digital controller receives input signals Vil to Vin from a multiplexer 1 to convert them into digital values with the use of an AD converter so that they are fed through an input port 3 into a digital operating portion 4 thereby to accomplish the preset operation. The resultant output is generated through the input port 3, a DA converter 5 and a multiplexer 6 thereby to control the process. The port 3 is connected with a CMOS RAM 8 of low capacity and power consumption so that the data to be retained during interruption of service are stored. Even in case the service of a system power source is interrupted, the power source of the RAM 8 is supplied from a capacitor C and is retained until the system restores.</p> |