Paper Title
Development of Process Automation System for Servicing of ISRO Satellite launch Vehicles during Vehicle Assembly

The paper deals with development of PLC based process automation system for servicing of ISRO satellite launch vehicle during assembly of its stages. PLC based Process Automation System is realized and being used for PSLV and GSLV-mk2 launch variants. The existing automation system needs to be augmented to meet the requirements of Geosynchronous Satellite Launch Vehicle Mark III , which is a launch vehicle currently under development by the Indian Space Research Organization. De mineralized water filling into the water tank of liquid stage (L110) of Geo Synchronous Satellite Launch Vehicle Mark-III is one of the main servicing activity carried out during vehicle assembly. This paper deals with design and development of program and its associated Graphical User Interface for filling process. Keywords- Programmable Logic Controller (PLC), SCADA (Supervisory Control and Data Acquisition), Flow Control Valve (FCV).