A plasma processing apparatus for generating a plasma of a processing gas by applying a high frequency power to an electrode provided in a processing chamber and processing a substrate using the plasma is provided. The master station communication device transmits a transmission request simultaneously to the slave station communication devices. The software modules may be received advantageously over a wireless interface. As a result, an extraneous communication overhead occurs between the DSP and the CPU. This solution allows:Performing the rope changing operation with the jib hoisted, thus allowing the maneuvers of vessels and the operation of contiguous cranes. The first magnetic conductive layer and the second magnetic conductive layer have a higher specific resistance than the non-magnetic conductive layer, and the first magnetic conductive layer has been manufactured by plastic forming or plating.