The incubator systems "", PLC based design. Design during application of temperature sensor, digital display tube, the heating device, cooling water pumps, coolers, storage tanks, temperature display, valves and status indicator components. The thermostat system requirements to control the water temperature of the incubator "" to a set value in the range of 20 ~ 80 ℃. Two digital display tubes were used to display the set temperature and display the test temperature. When the water temperature below the set value, the electric heating to heat up. When the water temperature is higher than the set value, to release some hot water, and start the cooling water pump so that flow through the cooler cooling water supply to the incubators "". This system as the core of the PLC controller, the design of control systems hardware and software program to complete the requirements of control tasks.
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