Abstract: The invention provides for an upgrading of equipment without the potential problems in replacing the existing system. A relay mechanism is interposed between the existing remote sensor and the existing controller, and between the existing controller and the existing remote operational mechanism. The relay mechanism permits the existing system to perform as before while allowing the signals from both the existing remote sensor and the existing controller to be monitored by a new and isolated replacement controller until such time that the existing controller is isolated allowing the replacement controller assumes operational duties. In this manner, the upgrading of the system is done without the costs of down time nor the potential for catastrophic results.

Abstract: The invention provides a control system which is resistant to external interference such as hacking. The control system receives sensor data from a remote sensor indicating a physical condition such as temperature, flow rate, or internal pressure, and provides operational data to a remote operational mechanism such as those found in a variety of production and manufacturing environments which is adapted to influence the physical condition. The system employs a memory unit which contains a data set establishing range of operational values for the operating mechanism. A programmable logic circuit accesses the data set and the sensor data, allowing the programmable logic circuit to generate the operational data for the remote operational mechanism. To maintain the data in pristine state, a programmable unit periodically accesses the memory unit to verifying that the range of operational values within the data set is within a prescribed range and adjusts the data set to comply with the prescribed range.

Abstract: The invention provides for an upgrading of equipment without the potential problems in replacing the existing system. A relay mechanism is interposed between the existing remote sensor and the existing controller, and between the existing controller and the existing remote operational mechanism. The relay mechanism permits the existing system to perform as before while allowing the signals from both the existing remote sensor and the existing controller to be monitored by a new and isolated replacement controller until such time that the existing controller is isolated allowing the replacement controller assumes operational duties. In this manner, the upgrading of the system is done without the costs of down time nor the potential for catastrophic results.