Different nodes should use different delay times, either by assigning each a different, fixed delay or by using random values. Otherwise, the nodes will all retry at the same time and no one will ever get through. The receiving nodes must also recognize and ignore failed attempts at transmitting. Collision-detecting protocols typically aren’t practical for RS-485 networks. With the UARTs used for most RS-485 interfaces, the nodes aren’t able to examine each bit as it arrives, so bit-by-bit collision detecting isn’t possible. If two or more drivers are enabled, RS-485 chips have protection circuits that limit the current and eventually disable the outputs, but the currents can be as high as 250 mA before the output is disabled. These safety features are useful for protecting the circuits during occasional malfunctions, but a protocol that routinely causes these high currents wastes power and can stress the circuits. In contrast, open-collector and open-drain logic used in I2C synchronous communications can have multiple drivers enabled without drawing large currents, and the software is often capable of bit-by-bit monitoring. Using Existing Protocols One way to get network programming up and running is to use an existing protocol. Various organizations and companies have developed protocols used in serial communications. A fieldbus is a digital communications link developed for monitoring and control systems. These are some examples of standard fieldbuses used in RS-485 networks: • BACnet Building Automation Control network . For building automation and other monitoring and control applications. From the American Society 270 Network Programming of Heating, Refrigerating, and Air-Conditioning Engineers ASHRAE :www.ashrae.com . • BITBUS. Introduced by Intel. General-purpose primary/secondary protocol. BITBUS European Users Group www.bitbus.org has documentation. An expanded version is defined by the withdrawn IEEE Standard 1118-1990. • CTNet. Features de-centrali prom-electric.ru

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Высветилась неисправность er123 на преобразователе частоты M600-06400470A. Похожие устройства ATS48D88Q, CIMR-F7Z47P51B, EI-P7012-450H установленные на экструдерах без аварий.
Направление нашел через гугл по запросу "Ремонт высоковольтного аппарата испытания изоляции АИИ-3 в Санкт-Петербурге" prom-electric.ru/articles/4/1315/ . Был неисправен полевик.
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Загорелась error er94 на преобразователе M400-02200024A. Другие устройства ATV61HC13N4, CIMR-XCBEB0P7, CIMR-V7SC43P77 установленные на двигателях без аварий.
Значение нашел в яндексе по запросу "Ремонт частотного преобразователя Altivar atv312h055m3" prom-electric.ru/articles/1/375/ . Оказалось сгорел экран.
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Высвечивается ошибка a192 на частотнике M600-05200250A. Подобные устройства ATSU01N206LT, CIMRG5C42200F, E1-7011 030H на насосах без ошибок.
Инструкцию нашел через nigma по запросу "ШИМ регулятор скорости вращения двигателя постоянного тока с помощью LPT порта компьютера" prom-electric.ru/articles/2/335/ . Сгорел модуль Infineon.
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Попалась авария w221 на частотном преобразователе SJ700-750HFUF2. Аналогичные устройства ATS48D88Q, VZA27P5FAA -s5030, VFD015S43E на вентиляции исправны.
Объяснение нашел через гугл по запросу "psmn050-80ps" prom-electric.ru/media/PSMN050-80PS.pdf . Оказалось подгорел микроконтроллер.
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Произошла неисправность a114 на преобразователе N3-202-C. Аналогичные устройства ATV71QC31Y, CIMR-F7Z40300A, VFD015E21A установленные на вентиляции без ошибок.
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