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日立公司的∑系列是综合仪表控制系统。它的最大特点之一是把模拟测试仪表和数字测试仪表密切相结合,它既包含了通常的模拟调节器,也包含了程序控制和直接数字控制(DDC)等数字系统。其中微计算机被广泛使用作为程序装置和 DDC 的运算中枢,或是作为智能终端的运算部分,这就使微计算机成了∑系列的一大支柱。本文以一个由微计算机构成的 DDC 系统的实例,来说明微计算机在∑系列中所起的作用,
Hitachi’s Sigma Series is a comprehensive instrumentation control system. One of its most salient features is the close combination of analog and digital testers, which include both analogue regulators in general and digital systems such as program control and direct digital control (DDC). Among them, the microcomputer is widely used as a computing device of a program device and a DDC, or as a computing part of a smart terminal, which makes the microcomputer a pillar of the Σ series. In this paper, an example of a DDC system composed of micro-computers to illustrate the role of micro-computer in the Σ series,