Abstract: In a plane motion mechanism, a table is mounted on a top planar surface of a base for movement thereon in plane motion. One end portions of respective first, second and third power transmitting elements adjacent respectively to one ends thereof are wound about an outer peripheral side surface of the table. At least two, first and second, drive units are provided, to which the other ends of the respective first and second power transmitting elements are connected respectively, for applying tension forces respectively to the first and second power transmitting elements. A tension-applying unit, to which the other end of the third power transmitting unit is connected, is provided for applying a tension force to the third power transmitting element. The table may be circular in cross-section and having an outer peripheral side surface.

Abstract: A sequence control system includes a main memory unit for storing therein a sequence program, an operation and control unit for decoding the sequence instruction and executing the designated operations, an input unit for fetching states of a process to be controlled as inputs, and an output unit for producing an output signal to control the process.

Abstract: A programmable sequence controller is provided with a display signal processor for preparing and correcting a sequence program in combination with a CRT (or cathode ray tube) display device. The signal processor simply effects signal processing of branch points and composition points in case where a so-called "ladder diagram" constituting the sequence diagram with relay symbols is prepared and displayed. Branch information is stored in an FIFO (or first in first out) register. The branch information is sequentially received and stored, and the information thus stored is read out in the order of storage, thus preparing the ladder diagram. There are provided a register for instructing the FI operation and a register for instructing the FO operation. The sequence display controller is applicable to the cases where a new ladder diagram is to be prepared, the diagram once prepared is corrected, and the operation is checked.