![]() The PLC (programmable logic controller) was developed to replace physical relays and timers with a purpose-built small computing unit designed for industrial environments. Although a great improvement over manual control, this type of automation structure had a major disadvantage: to change the function (or logic) of the control system, the system had to be literally re-wired. Banks of relays appeared in semi-automated factories, notably automobile plants. Industrial automation was originally implemented with discrete relays and timers, which were connected with copper wire. ![]() Compare PLCs and Ladder Logic with Opto 22 Hardware and Software ![]()
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