Is currently the world's most used PLC programming language in the PLC program diagram, left and right bus similar relay and contactor control power cord, output coil similar to electrical appliances, input electrocution similar to switches, trapezoidal chart by a number of classes, top-down arrangement, each class from the left bus, through electric shock and coil, stop at the right bus. The following program programs the automatic door control program according to the trapezoidal diagram.
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