Abstract: There is provided a production operation management system capable of executing efficient management of production operation by enabling exchange of information with a distributed control system.

Abstract: A distributed control system comprising a control station and a remote input/output device interconnected by a bus, wherein the system is provided with a continuation transmission service which first transmits an urgent output only and then performs cyclic scan transmission; an initialization start transmission service which first performs cyclic scan transmission for input only; an interruption duration measuring feature which measures the period of transmission interruption; and a control feature which activates the continuation transmission service when the result of the measurement is shorter than a predetermined period of time, and which activates the initialization start transmission service when the result of the measurement is longer than the predetermined period of time. Thus, for example, after a power supply failure, the system can rapidly recover and shift to normal process controlling operation without the delays normally experienced by prior control systems.

Abstract: An electronic air conditioner, in which a charging section, a dust collecting section (including an electrostatic dust collecting section and an ozone reducing section) and a negative ion generating section, known per se, are arranged in this order along the flow path of air extending from the air inlet to the air outlet in a casing of insulating material to provide a compact electronic air conditioner capable of air hearing, air cooling and air cleaning. At an appropriate position between the air inlet and the air outlet in the casing, a fan is provided to cause a flow of air. Between a mechanical filter provided at the air inlet and the negative ion generating section, a heat exchanger is provided to act on the flow of air for heating or cooling the same. The endothermic-and-thermoradiation fins of the heat exchanger can be also used as a dust collector if grounded.