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1. 发明专利

JP2011107807A Process control device 有权
标题翻译：过程控制设备
公开(公告)号：JP2011107807A
公开(公告)日：2011-06-02
申请号：JP2009259560
申请日：2009-11-13
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MASUNAGA SUNAO , ISHII KAZUHIKO , ISHIKAWA MASAKAZU , SASAKI WATARU , SHIMIZU MAI
IPC分类号： G05B9/02 , G05B9/03
摘要： PROBLEM TO BE SOLVED: To provide a process control device capable of reducing the fluctuation of output currents when any failure occurs in a part of a output system, and restoring an original level in a short time. SOLUTION: The process control device includes a redundant analog signal output circuit for output of a current signal for controlling an object to be controlled. A process control arithmetic part (digital controller), by comparing a digital output value by instructing the analog signal output circuit with the results of the analog conversion of the digital output value, detects the failure of the analog signal output circuit, separates the circuit which the failure has been detected, and instructs each analog signal output circuit which has not been broken down in the uniform digital output value so that the current signal to be output to the object to be controlled can be obtained by synthesizing current signals to be uniformly output from one or more analog signal output circuits which have not been broken down. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够在输出系统的一部分发生故障时能够减少输出电流的波动并且在短时间内恢复原始电平的过程控制装置。解决方案：过程控制装置包括用于输出用于控制要控制的对象的电流信号的冗余模拟信号输出电路。一个过程控制运算部分（数字控制器），通过将模拟信号输出电路指示数字输出值的模拟转换结果与数字输出值进行比较，检测模拟信号输出电路的故障，分离出电路已经检测到故障，并且在统一的数字输出值中指示未被分解的每个模拟信号输出电路，使得可以通过合成将均匀输出的电流信号来获得要输出到被控制对象的电流信号来自一个或多个未被分解的模拟信号输出电路。版权所有（C）2011，JPO＆INPIT

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