Use LabVIEW to Program the Next-Generation PLC If you log on to any industrial control discussion forum, you find threads about the advantages and disadvantages of PC-based control and programmable logic controller (PLC) control. Recently, you may have also seen some threads discussing PACs and asked the question, “What the heck is a PAC?” To understand PACs, you need to review the history of industrial control.
In the 1960s, engineers achieved industry control using large banks of mechanical relays. These systems were complicated, hard to modify, and prone to failure. In the late 1960s, Bedford Associates proposed a new system called Modular Digital Controller (MODICON), which used a CPU to perform digital logic and interface with digital inputs and outputs. Think of this system as the first “virtual instrumentation” for industrial applications. The MODICON 084 was the first PLC. The new PLCs efficiently performed digital operations and digital control and became very popular by mid-1970. Early PLCs used bit slice-based CPUs, such as the AMD 2901, and were limited to digital control.
To make them reliable and simple to program, PLCs employed rigid control architectures and simple instruction sets. Engineers programmed the majority of PLCs using ladder logic, a language created to mimic the original relay diagrams of the 1960s. to download the whole white paper please click here. http://www.ni.com/pdf/labview/us/next_gen_plc.pdf
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