Process Control
There will be different parameters for critical processes that have to be monitored. The real time values of these parameters will be fed to a central control system. These values are compared with the preset set-points through feedback systems and the necessary alerts are output on the display system, so that corrective action can be taken.Representative process control system is one in which, a laser diode acts as the measuring device for detection of liquid/gas present in a given industrial environment.
The frequency signature of concerned material (liquid/gas) is then passed on to the receiver. It is then converted in digital form and picked by the processor. Distributed Control Systems, commonly abbreviated as DCS, are central control systems, which are good at controlling analog devices; thereby aiding in process control.
In a manufacturing setup, feedback from different sensors tendering to many processes are given to a bank of PLCs. Each process has a separate set of PLCs and the output of these which contain information regarding the status at the shop floor is given to the DCS. PLC is just a controller and DCS is a central controller with a MMI [Man Machine Interface]. Corrective controls are input to the DCS, which is given to the PLC and thereafter sent to the individual control devices.
