New instrument technician, some small questions about DCS
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1. It seems that the channel terminals of the AI AO module are all at 24V. Are the channel terminals of the DI DO module also at 24V? Could you please explain in detail what conditions an instrument must meet in order to be connected to these modules for control purposes? Or can anything that is powered by 24V be connected to the modules? (For example, I have a light that is powered by 24V – can it be connected to the module as well, and can it be used to control the light?) I’m a beginner, so my wording might not be very precise; please help me understand this
Not all modules require 24V; it depends on the power distribution requirements. For DI/DO modules, the contact capacity also needs to be taken into account to avoid blowing fuses
Uh. . . I suggest buying a book on the basics of instrumentation work from Taobao and reading it first. To be honest, I’m not quite sure what you’re trying to express, haha. First of all, this 24V voltage (it’s not necessarily 24V; it could also be 12V or something else) is direct current, and control circuits operate using direct current to form circuits ； As for contacts such as AI, AO, DI, and DO, they can be divided into dry contacts and wet contacts, that is, active and passive types. In short, it’s necessary to first understand the basics of instruments. If you don’t like reading, you can opt for illustrated versions or those with legends; a basic introductory guide will suffice. Once you’ve got the basics down, start working on practical applications, and over time you’ll gain more in-depth knowledge – it’s all about progressing step by step.
Which signals require which modules depends on your own needs
It’s powered by 24V; without power, how can the cards function, and how can the instruments on site work?