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Practical Industrial Data Networks:Design, Installation and ...

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202 <strong>Practical</strong> <strong>Industrial</strong> <strong>Data</strong> <strong>Networks</strong>: <strong>Design</strong>, <strong>Installation</strong> <strong>and</strong> TroubleshootingSpurs can be connected to the ‘home run’. The length of the spurs depends on the typeof wire used <strong>and</strong> the number of spurs connected. The maximum length is the total lengthof the spurs <strong>and</strong> the home run.One Bit Time (1/fr)ClockNRZManchesterBiphase L+0+0+–ENCODING AND DECODING–T/2T/2ttT/2–T/2Logical "0"Logical "1"–T/2 T/2tt–T/2 T/2N+ENCODING RULESN–SymbolsEncoding10N+N-(ONE)(ZERO)(NON-DATA PLUS)(NON-DATA MINUS)Hi-Lo transition (mid-bit)Lo-Hi transition (mid-bit)Hi (No transition)Lo (No transition)Figure 14.1Foundation Fieldbus physical layerENCODING RULES

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