Patent US 4,129,901

A sequence control system is disclosed which is suitable for control of plural objects to at least some of which similar control sequence operations are performed. In addition to a logical operation unit for receiving signals representative of states of the controlled objects through an I/O device to perform the operations for the desired controls, and a memory unit for storing programmed instructions for logical operations by the logical operation unit at predetermined program addresses, the system is provided with a device for executing repeatedly the processings common to the objects to be controlled. The time required for the processing in the logical operation unit for controlling the objects requiring similar control operations can be remarkably reduced. The system has an excellent utility in applications such as numerical control apparatus in which many objects have substantially identical control operations and are to be controlled at high rate.