问题描述：
英语翻译
Relay users that have a machine or process operating with some or all of the following characteristics would be candidates for programmable controller-based control:repetitive operations,time-driven operations,event-driven operations,high speed control,and requirements for data acquisition/manipulation.A few application examples with these characteristics include conveyors,packaging operations and vending machines.
Choosing the Right Programmable Controller
After a user justifies the conversion from relays to programmable controllers,the next step is to Define the Control Application.Defining the control application to get the number of field devices is the first of four procedures in choosing the programmable controller specification.This procedure involves identifying and describing each of the functions within the process.For example,
Relay users that have a machine or process operating with some or all of the following characteristics would be candidates for programmable controller-based control:repetitive operations,time-driven operations,event-driven operations,high speed control,and requirements for data acquisition/manipulation.A few application examples with these characteristics include conveyors,packaging operations and vending machines.
Choosing the Right Programmable Controller
After a user justifies the conversion from relays to programmable controllers,the next step is to Define the Control Application.Defining the control application to get the number of field devices is the first of four procedures in choosing the programmable controller specification.This procedure involves identifying and describing each of the functions within the process.For example,
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