JPS56166501A - Dual system of adjusting device - Google Patents

Abstract

PURPOSE:To cause contents of integral value memories in respective adjusting devices to coincide with each other, by giving contents of the integral value memory in a current adjusting device to the integral value memory of a stand-by adjusting device to update contents of this integral value memory. CONSTITUTION:A transmission and receiving control part 17 using the same microprocessor or the like as an operating part 13, an analogue-to-digital converer ADC 18, and a digital-to-analogue converter DAC19 are provided; and when its own PID adjustment meter of the device comes into use on a basis of a control signal CS, the control part 17 reads out contents of an integral value memory 15 periodically and gives them to the DAC19 and transmits contents of them to a stand-by PID adjustment meter as transmission data DS. When its own PID adjustment meter of the device becomes stand-by, the control part 17 gives the digital signal output of the ADC18 to the integral value memory 15 on a basis of the control signal CS and gives transmission data DS from the current PID adjustment meter to the ADC 18 as receiving data DR to updata contents of the integral value memory 15, thereby causing always contents of the integral value memory 15 in the current PID adjustment meter to coincide with contents of its own integral value memory 15.