PLC has a function of counter embedded in its software library. A counter is nothing but a function that counts things. For example, if we assign asensorto a digital input of PLC. The counter is configured in the PLC to work as a step-up counter. That means, whenever the sensor change...
So, what exactly is a control or function block? They give us extra functionality in our PLC system. You have probably seen or used a basic timer or counter while looking through the program of a PLC. When looking at the ladder logic, it literally looks like a block in the middle of ...
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As you see in picture 6, the Tank2Level variable is set to be a retained value, which means even if the PLC stopped or there was a power failure, the Tank2Level will have the same data stored when the PLC is on again. It will not be reset to the start value. ...
Programmable Logic Controller(PLC) is an electronic system operated by digital operations, specially designed for application in an industrial environment. It uses a memory that can be programmed to execute instructions for storing logical operations and sequence control, timing, counting and arithmetic ...
实现机械本质安全有多种方法。例如，A减少或消除操作人员接触机器危险部位的次数：B提供保护装置或个人防护装备；C消除产生危险状态的原因：D使人员难以接近机任的危险部位。按照机器本质安全的原则，上面四种方法优先顺俘是（）.
a你可以看出J6和J7的1腿方向应该是反了 You might see J6 and the J7 1 leg direction should be counter-[translate] adeligent Incorrect, the correct is: diligent! deligent不正确,正确是: 努力![translate] a一整套开尾设备大概25万人民币 正在翻译,请等待...[translate] ...
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Holding many companies in different industries can be a boon for a conglomerate'sbottom line. Poorly performing companies are offset by other sectors.Cyclicalcompanies can be balanced bycounter-cyclicalor noncyclicals. The parent corporation can reduce costs by utilizing fewer inputs that may be sha...