ConvertingRelaystoProgrammableControllersIntroductionForyearsnow,engineershavebeenconsiInthebottlingfacility,forexample,photoelectricsensorscanbeassignedtodetectthebottle’sposition,anddrivescanbeassignedtoadvancethec

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Converting Relays to Programmable Controllers Introduction For years now,engineers have been consi
In the bottling facility,for example,photoelectric sensors can be assigned to detect the bottle’s position,and drives can be assigned to advance the conveyor,etc.These field devices also should be grouped by whether they sense an event has occurred or is occurring (inputs) or whether they are to be controlled (outputs).Then proceed to count the number of field devices (whether they be inputs or outputs) the control system requires.(Note that although control systems require up and down counters -- as well as timers and other higher level functions -- they should not be considered I/O devices.)
The second procedure is determining the Speed of the Operation.A programmable controller is faster than relay-based systems in all but the simplest control systems.However,throughput times vary from programmable controller to programmable controller.For this reason,it is important to consider the following:

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