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CHEMICAL ENGINEERING
and technical supervision can call up and display any section of the process to review
the operating parameters and adjust control settings. Abnormal and alarm situations are
highlighted and displayed.
Historical operating data is retained in the computer memory. Averages and trends can
be displayed, for plant investigation and trouble shooting.
Software to continuously update and optimise plant performance can be incorporated
in the computer control systems.
Programmable logic controllers are used for the control and interlocking of processes
where a sequence of operating steps has to be carried out: such as, in batch processes,
and in the start-up and shut down of continuous processes.
A detailed discussion of the application of digital computers and microprocessors in
process control is beyond the scope of this volume. The use of computers and micropro-
cessor based distributed control systems for the control of chemical process is covered
by Kalani (1988).

5.11. REFERENCES

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