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一、前言 PMK型可编程调节器现已被许多用户应用到控制系统中。但是,目前在使用上所采用的由侧面板的设定单元按键和前面板操作按钮进行M/A/R切换的方法,存在着一些问题: 第一,这种切换投运方法给正常使用带来麻烦。在系统正常工作时,为保证安全生产,一般将调节器锁住(即不能从正面将机芯拉出)。这样,需要再进行M/A/R无扰动切换时,若不能从正面板直接进行,则不得不重新解锁,拉出侧面板。这不但麻烦而且耽误时间。
I. Introduction PMK programmable controller has now been applied to many users in the control system. However, there are some problems in the current method of M / A / R switching by using the buttons of the side panel and the buttons of the front panel, which are used in the prior art. First, the method for switching the operation mode to the normal use band To trouble. In the normal work of the system, in order to ensure safe production, the regulator is generally locked (that can not be pulled out from the front of the movement). In this way, if the M / A / R switchover is required without disturbance, if it can not be directly performed from the front panel, it will have to be unlocked again to pull out the side panel. This is not only cumbersome but also a waste of time.