1634_PAC_White_Paper - Understanding Programmable...

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Understanding Programmable Automation Controllers (PACs) in Industrial Automation WHITE PAPER Form 1634-080519 PACs in Industrial Automation PAGE 1 Meet the Modern Industrial Application Implementing a modern industrial application can present a challenging and sometimes daunting mix of requirements. For example, it is well understood that a typical control system must interface with signals from simple sensors and actuators, yet for many modern applications this is merely the starting point. Advanced control features, network connectivity, device interoperability, and enterprise data integration are all capabilities increasingly demanded in a modern industrial application. These modern requirements extend far beyond the traditional discrete-logic-based control of input/output (I/O) signals handled by a programmable logic controller (PLC). Most PLCs are programmed using ladder logic, which has its origins in the wiring diagrams used to describe the layout and connections of discrete physical relays and timers in a control system. Applications that diverge from or expand beyond this model become increasingly hard to program in ladder logic. For example, mathematically complex applications such as proportional-integral-derivative (PID) loops used for temperature control involve floating-point arithmetic. To perform these calculations, PLCs must often be enhanced with separate—and separately programmed— hardware cards. Analog I/O Serial I/O This modern industrial application encompasses multiple tasks requiring I/O point monitoring and control, data exchange via OPC, and integration of factory data with enterprise systems. PID loops SQL database Digital I/O Operator interface OPC clients PAC Motion control SCADA Human- machine Interface
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Understanding Programmable Automation Controllers (PACs) in Industrial Automation PAGE 2 Making a PLC More Like a PC Using a PLC to meet modern application requirements for network connectivity, device interoperability, and enterprise data integration presents other challenges. These types of tasks are usually more suited to the capabilities of a computer (PC). To provide these capabilities in a PLC-based application, additional processors, network gateways or converters, “middleware” software running on a separate PC, and special software for enterprise systems must often be integrated into the system. Making a PC More Like a PLC On the other hand, a PC packaged for industrial environments can provide many of the capabilities sought in modern applications, particularly those needed for networking and data communication. Similar to augmenting a PLC to accomplish PC-like tasks, however, an industrial PC that needs to perform PLC-like tasks, such as machine or process control, also requires expansion. For example, a PC may be using an operating system that is not optimized for high-performance and deterministic industrial applications. Additional I/O expansion cards or special extensions may need to be integrated into the PC’s
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This note was uploaded on 09/28/2009 for the course X RAY MECH EMP5209 taught by Professor Hui-leo-chen during the Fall '09 term at University of Ottawa.

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1634_PAC_White_Paper - Understanding Programmable...

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