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Many engineers and technicians in the motor control industry consider a programmable logic controller (PLC) a necessary component for variable frequency drive (VFD) control. This may have been true years ago, but VFD technology has improved and made technological advances in recent years. VFDs have developed so that the need to install and program a PLC, which was previously required for many applications, has been eliminated. This advancement results in overall cost and space savings. Additionally, the wiring and programming complexity is reduced significantly.

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