![]() #COMMUNICATE WITH ROCKWELL PLC FROM PC SOFTWARE#Also, advances in software allow users to easily configure and use special functions that make PLCs do much more than logic control. Reasons for this gain include reliability, simplified wiring, and scalability. Because of this, the tendency to replace larger PLCs by networked configurations of smaller PLCs will gain ground, according to ARC Advisory Group. 1) - those with up to 32 I/O points - are gaining networking capability, while micro PLCs - those with up to 129 I/O points - are becoming more sophisticated functionally. The cost of processing power is decreasing, communications capabilities are improving, and open systems are becoming more accepted. #COMMUNICATE WITH ROCKWELL PLC FROM PC CODE#Protection of the control code and execution activities from outside influencesįunctional isolation to ensure a dedicated control response. Realtime determinism for reading and writing input/output (I/O) valuesĮnsured robustness and reliability in execution and continued operation ![]() Realtime determinism for process execution Characteristics of this technology include: PLC technology is entrenched in more than 30 yr of control fundamentals. Relay logic is called ladder logic because the program looks like a ladder when it is drawn pictorially - unlike a high-level programming language, such as C++ or BASIC, which uses alphanumeric characters. Relay logic was used to design motor circuits as well as entire relay control panels. Other than entirely hard-wired systems, this is about as simple as it gets. The IEEE defines a programmable controller, or PLC, as a “solid-state control system with programming capability that performs functions similar to a relay logic system.” Relay logic - or ladder logic, as it is frequently called - got its name from many years of using relays to control industrial equipment. Perhaps the answers lie in the evolution and combination of technologies. So, which is best - computer controls, or PLCs - when it comes to controlling industrial equipment and processes? This squabble has been brewing for several years with no clear-cut answer. However, software controls running on personal computers (PCs) have made inroads to industrial automation and process control in recent years. Since the dawn of the programmable logic controller (PLC), plants have come to expect reliability, stability, and simplicity from them. Programmable automation controllers - the next generation? PACs combine the best parts of the PLC with the best parts of the PC. The line between PLCs and industrial computers running control software is becoming blurred. ![]() The PLC has become greater than the sum of its card slots. ![]()
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