[..] Computers and microcomputers may also be used, but they tend tooto overcomplicate the task and often require highly trained personnel to develop and maintain the system. A simpler device, designed to operate on inputs and outputs one-at-a-time and configured to resemble a relay system, was introduced. These devices became known to the controls industry as [[programmable logic controller|Programmable Logic Controller]]s (PLC). The Motorola MC14500B Industrial Control Unit (ICU) is the monolithic embodiment of the PLC's central architecture [..]
There are functions for which one bit machines are poorly suited. [..] Under some circumstances, a combination of an [[Motorola 6800|MC6800]] MPU and an MC14500B ICU may be the best solution. [..]
