the method used by the plc to write a ladder logic program is called

Manufacturing data needs to be collected and passed on to a central computing system.

A modular design had to be used so that subassemblies could be easily removed, replaced and repaired.

Input and Output (I/O) interfaces had to be easily replaceable.

Pricing had to be competitive with relay control systems.

Programming had to be easy and be able to be maintained by plant electricians.

Controllers had to be capable of surviving an industrial environment.

The system had to have the flexibility of a computer system.

The GM engineering team designated the following criteria for the project:

A company named Bedford and Associates, (later named Modicon), was hired by GMC to design a way to speed up this process. Automating the process would reduce labor and downtime while increasing profits. The model change had been a very labor-intensive process. The GMC Hydramatic division sought a way to automate the model changeovers. In the 1960’s, General Motors Corporation decided to take the lead in changing their shop floor process. All this downtime and labor reduced profits for the automaker. It took massive amounts of labor hours by skilled electricians and millwrights to get this accomplished. When a model change was warranted, production lines could be shut down for weeks while assembly lines were rewired and retooled. It took hundreds of motor control panels with thousands of electromechanical relays, motor starters, pilot devices and controls to run the assembly lines on the shop floor. PLC’s were first developed for the automotive industry.

The method used by the plc to write a ladder logic program is called