1756-DHRIO是羅克韋爾自動化的可編程控制器。
1756-DHRIO可編程控制器是60年代末在美國首先出現(xiàn)，當時叫可編程邏輯控制器PLC（ProgrammableLogicController），目的是用來取代繼電器，以執(zhí)行邏輯判斷、計時、計數(shù)等順序控制功能。隨著半導(dǎo)體技術(shù)，尤其是微處理器和微型計算機技術(shù)的發(fā)展，到70年代中期以后，PLC已廣泛地使用微處理器作為中央處理器，輸入輸出模塊和外圍電路也都采用了中、大規(guī)模甚至超大規(guī)模的集成電路，這時的PLC已不再是邏輯判斷功能，還同時具有數(shù)據(jù)處理、PID調(diào)節(jié)和數(shù)據(jù)通信功能。
可編程控制器（Programmable Logic Controller，PLC）是一種專門為在工業(yè)環(huán)境下應(yīng)用而設(shè)計的數(shù)字運算操作電子系統(tǒng)。它采用一種可編程的存儲器，在其內(nèi)部存儲執(zhí)行邏輯運算、順序控制、定時、計數(shù)和算術(shù)運算等操作的指令，通過數(shù)字式或模擬式的輸入輸出來控制各種類型的機械設(shè)備或生產(chǎn)過程。
可編程控制器由微處理器為核心，輸入模塊、輸出模塊和編程器幾大部分組成，具有體積小、重量輕、能耗低、可靠性高，以及維修方便等優(yōu)點，在工業(yè)自動化控制中廣泛應(yīng)用。

1756-DHRIO

The 1756-DHRIO is a programmable controller for Rockwell Automation.
At the end of the 1756 – DHRIO programmable controller is in the ’60 s first appeared in the United States, was called a programmable logic controller PLC (ProgrammableLogicController), the purpose is to replace relay, to perform logic, timing, counting and other sequence control function. With the development of semiconductor technology, especially microprocessor and microcomputer technology, after the mid-1970s, PLC has been widely used as a central processor, input and output modules and peripheral circuits are also used in the medium, large-scale or even very large scale integrated circuits, then the PLC is no longer a logical judgment function. It also has the functions of data processing, PID regulation and data communication.
A Programmable Logic Controller (PLC) is a digital operational electronic system designed specifically for use in industrial environments. It uses a programmable memory in which the instructions for performing operations such as logical operations, sequence control, timing, counting and arithmetic operations are stored, and various types of mechanical equipment or production processes are controlled through digital or analog input and output.
The programmable controller is composed of the microprocessor as the core, the input module, the output module and the programmer. It has the advantages of small size, light weight, low energy consumption, high reliability, and easy maintenance, and is widely used in industrial automation control.

1756-DHRIO

1756-DHRIO