PLC's ARE NOW PREFERRED IN MANY OIL-FIELD OPERATIONS.

In recent years, programmable logic controllers (PLC's) have evolved to such a point that in small control systems typical of oil field production operations, they are often technologically and economically preferred over hard-wired relays. Advantages of PLC's include reduced development and training time that is possible because of standardized development and documentation. The standardization also simplifies troubleshooting and spare part requirements.