termsusedindescribingthevarioussystems. ASCII:ThisstandsforforStandardCodeforInformationInformation AsshowninFig.1,whentheletterletteristransmitted,for instance,itsautomaticallycodedasasbythesendingequipment.TheThe devicescancommunicatewitheachotheraslongasbothuseASCIIcode. ASCIImodule:ThisintelligentPLCmoduleisusedfo...
Host computer: This is a computer that's used to transfer data to, or receive data from, a PLC in a PLC/computer network. Intelligent device: This term describes any device equipped with its own CPU. I/O: This stands for "inputs and outputs," which are modules that handle data to ...
These messages travel in both directions on the bus from the point of connection until they are dissipated by terminators at each end of the bus. CPU: This stands for "central processing unit," which actually is that part of a computer, PLC, or other intelligent device where arithmetic and...
To understand the PLC's communications versatility, let's first define the terms used in describing the various systems. ASCII: This stands for "American Standard Code for Information Interchange." As shown in Fig. 1, when the letter "A" is transmitted, for instance, it's automatically coded...
61、ommunications are available and when they would be best applied.To understand the PLCs communications versatility, lets first define the terms used in describing the various systems.ASCII: This stands for American Standard Code for Information Interchange. As shown in Fig. 1, when the letter...
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ASCII: This stands for quotAmerican Standard Code for Information Interchange.quotAs shown in Fig. 1 when the letter quotAquot is transmitted for instance its automaticallycoded as quot65quot by the sending equipment. The receiving equipment translates the quot65quotback to the letter quotA.quot ...
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However, there's much more regulation for a PLC in the U.K. than for a public corporation in the U.S. PLCs are required to hold annual general meetings open to all shareholders and are held to higher standards of transparency in accounting.9Because they’re public, they’re also vulnera...