LOCAL RETROFITTING OF PLC CONTROL SYSTEMS

摘要

A method of upgrading a process control system from an old programmable controller (PLC) to a non-PLC process controller is disclosed. A mounting rack sized to fit in a space occupied by old hardware is assembled and fitted with spare hardware including an I / O card, an I / O port block, and a custom interface module. The custom interface module coupled to the I / O card via the I / O port block and a plurality of process control field devices via an old wiring mechanism that is coupled to an old wiring of the process control system without any change or reconnection of the old ones Wiring required. The old wiring mechanism is disconnected from the old hardware, the rack containing the old hardware is removed and replaced with the rack, and the old wiring mechanism is coupled to the custom interface module.