Patent ID: 9020614
Filing Date: 2015-04-28
Classification: G05B

Abstract:
1. A plant control system comprising: a supervisory control and data acquisition (SCADA) system for providing at least one monitoring screen for monitoring operations of equipment in the plant and for manually controlling, by an operator of the SCADA system, equipment in the plant; a programmable logic controller communicating with the SCADA system, receiving and holding instructions, as control signals, from the SCADA system and transferring the instructions received from the SCADA system, to equipment in the plant that is controlled by the SCADA system, to control the equipment; and a single shot output functioning section communicating with the SCADA system and which causes the SCADA system to send a control signal to the programmable logic controller, and, after sending of the control signal, to send an erasure signal, erasing the control signal held in the programmable logic controller without execution of a program in the SCADA system that monitors transmission of control signals to the programmable logic controller, wherein