The PFM (Profibus Fieldbus Module) connects the APACS+ process automation system to Profibus - a high-speed, digital two-way serial communication bus. Profibus technology offers a wide range of applications in process and factory automation.
With a Profibus system, users have the opportunity to employ a truly open approach to vendor independence and interoperability using a broad range of Profibus products such as transmitters, valve positioners, remote I/O modules, variable frequency drives and many other common automation components used in applications throughout the process industries.
The PFM operates as a Profibus Master in an APACS+ system, providing realtime data access from devices on the bus. Process instrumentation in electrically hazardous areas of a plant are connected using Profibus-PA link-couplers. Couplers allow the APACS+ system with a PFM to interface with other popular buses such as ASi bus and DeviceNet.
Agency approvals - The PFM is now available with various agency approvals and their respective standards as listed in the table.
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The widely held belief in many plants that tuning will solve all base layer control problems is completely fallacious. Bad tuning is generally not the main reason for loops to perform badly. It is important when performing optimisation that all elements in a loop are considered, in addition to the control strategy, before even thinking of tuning.
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