PLC ANALOGUE CONTROLLER FOR A BATCH PLANT

This report addresses the approach of designing and implementing the logic control
functions for a batch process. The aim is to develop the controller for a batch process
using PLC. Batch process involves sequential processing that leads to the production of
finite quantities of material by subjecting quantities of input materials to an ordered set of
processing activities over a finite period of time, using one or more pieces of equipment.
Batch process can be classified as a discontinuous process. Liquid soap making is chosen
as the case study for the project. The CX-Programmer programming software was used
to develop the ladder diagram for the PLC, implementing the batch control. The concept
of controlling a control system involves a systematic approach, and the operation
procedure includes the determination of the machine sequence, inputs and outputs
addressing, and the PLC programming. Troubleshooting is conducted to ensure that the
program run in accordance to the intended process sequences and give the desired
response of the control valves, the final control elements connected to the PLC. This
approach is found to be effective in designing a logic ladder diagram for a PLC to control
a batch process, in this case a liquid soap making process.
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