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270 Electric Drives and Electromechanical Systems

PLCs. As discussed earlier, the range of facilities provided for analogue data manipula-
tion, continuous process control, and data communication in advanced PLCs ensures
that they are capable of solving complex and sophisticated control problems.

10.5 Summary

In this chapter we have considered the approaches to the control and controllers that
should give designers an appreciation of the power which is available in modern sys-
tems. Irrespective of the controller and the drive, the overall performance of a system is
as only as good as the weakest link in the chain. Designers therefore must have a clear
understanding of the performance specification prior to entering the design and
development process. In certain aspects, the controller is the key element, because it
provides a direct interface with the user; topics such as user interfaces have not been
considered here, but they do need to be reviewed as part of any design process. The
selection of a controller, its programming, and its interface to the system should be
undertaken with care.
However, we have only considered standalone items, the next chapter considers the
challenges of networking drives and controllers, together with the threats to networked
control systems.

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