First step- We have to translate all of the items we're using into symbols the PLC understands. The PLC doesn't understand terms like switch, relay, bell, etc. It prefers input, output, coil, contact, etc. It doesn't care what the actual input or output device actually is. It only ...
Before we get into Solid State and Relay PLC outputs, let’s clear up the difference between a Digital Output Module, or DO, and an Analog Output module, or AO. Digital or Discrete devices have only 2 possible conditions. As examples, these 2 possible conditions could be On or Off, Open...
Indicator lamps, solenoid valves, and motor starters (assemblies consisting of contactors and overload protection devices) are all examples of discrete control devices. In a manner similar to discrete inputs, a PLC connects to any number of different discrete final control devices through a discrete...
可编程逻辑控制器 (PLC) 是多数工业控制和工厂自动化系统的核心组成部分。通常被称为工厂的“大脑”,PLC 通过接收和处理来自传感器和机器的数据来控制广泛的功能。然后使用这些数据来控制和致动外部设备。 因为PLC 用于工业应用中,因此它的首要要求是稳健。除此之外,成功的设计必须具备可靠性、系统稳定性以及与连接的...
All examples shown were developed using RSLogix 500 v7.0 and RSView Studio v4.0 软件和固 件用例子所示,使用 RSLogix 500 V7.0 和 RSView 工作室 V4.0 Page 2of 22 AB PLC 配置变频器和触摸屏通信 V1.2 Document Purpose This document is not a manual or training material, but an Application Note...
itiscalledase alincircuit.Inthiscircuitthecurrentcanflowthrougheitherbranchofthecircuit,throu ghthecontactslabelledAorB.TheinputBwillonlybeonwhentheoutputBison.IfBisoff,andA isenergized,thenBwillturnon.IfBturnsonthentheinputBwillturnon,andkeepoutputBone venifinputAgoesoff.AfterBisturnedontheoutputBwillnot...
These are typically industrial processes in manufacturing where the cost of developing and maintaining the automation system is high relative to the total cost of the automation.PLCs contain input and output devices compatible with industrial pilot devices and controls.PLC applications are typically ...
Examples of discrete output devices are lights, relays and motor starters. From our dishwasher example inPart 1, some of the discrete inputs would the start button, the door switch and the water level switch. Some of the discrete outputs would be the water fill valve, the water drain valv...
7. SpacingIf the project allows for it, allow for some room between devices, PLC’s, drives, power supplies. This helps with maintenance accessibility. Also, it makes way for future expansions. More I/O if the PLC needs it, another drive …etc.. ...