Support-focused enterprise controls: template design strategies

The primary purpose of a support-focused control system is to produce a programmable logic controller (PLC) program that is easily understood by technicians. Hence the need for simple rule-based controls that provide common circuit constructs for conveyors that move objects and machines that move mechanisms. Together conveyor and machine applications interact with the majority of discrete inputs and outputs. Most manufacturers that have a process design team that focuses on developing applications that minimize the chance technicians will become confused. They recognize that design-induced confusion will extend downtime events. On the other hand, many controller experts and information technology (IT)-appointed system integrators do not have this focus. The focus differences are a result of experts having unique perceptions of what are important characteristics to their design. Regardless, the expert selected to provide template-based applications will likely adopt one of the two foll


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