The objective of this thesis is studying in the Programmable Logic Controller and its application for controlling the industrial process by designing the process monitoring software for PLC. This software be able to design and simulate the industrial process controlled by PLC. It be able to display the operation of process followed the operation of PLC on the monitor of computer. And user can control PLC through this software The Visual Basic 6.0 was used to design and develop the Process Monitoring Software so it can work under the Windows System. This Software supports the OMRON’s PLC (model CQM1). The communication between computer with PLC used communications protocol of PLC (Host Link Communication) and the standard RS232-C interface.
By
Natthaporn Ritthikulsitthichai
Natthapongsa Mokkawais
