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一、问题的提出在某些自动化设备中需要能够加减的可逆计数器,而加、减信号在某种情况下是同时输入的。这是由于现场运行状况所要求的。例如,在某种控制过程中,可以同时“进车”和“出车”,要计此过程的“存车数”就需要一种可以同时输入加、减信号的可逆计数器。现有的可逆计数器,加、减信号不能同时输入。本文主要讨论如何解决可逆计数器可同时输入加、减信号的问题。
First, the question put forward In some automation devices need to be able to add and subtract reversible counter, and add, subtract the signal is in a case of simultaneous input. This is due to the operational status of the site. For example, in a certain control process, “entering the car” and “leaving the car” may be required. In order to count the number of cars in the process, an up-down counter capable of inputting plus and minus signals simultaneously is needed. The existing reversible counter, add, subtract the signal can not be input at the same time. This article focuses on how to solve the reversible counter can be added at the same time, subtract the signal problem.