A temperature control system consists of four thermostats controlling three heating units. The thermostat contacts are set to close at 50°. 60 °, 70 °, and 80 °F, respectively. The PLC ladder logic program is to be designed so that at a temperature below 50 degree F, three heaters are to be ON. Between 50 °to 60 °F. two heaters are to be ON. For 60° to 70 °F, one heater is to be ON. Above 80 °F. there is a safety shutoff for all three heaters in case one stays on because of a malfunction. A master switch is to be used to turn the system ON and OFF. Prepare a typical PLC program for this control process.

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There are four thermostats assume them be in NC state when th... View the full answer