Conveyance system

A conveyance system for conveying a workpiece between a storage shelf and a plurality of processing machines, the conveyance system comprising:

• (i) a main controller which receives a conveyance request for a workpiece from the plurality of processing machines, the main controller retaining the received conveyance request and transmitting a standby signal indicating whether or not a plurality of conveyance requests are retained in the main controller, and
• (ii) a conveyance device which conveys the workpiece between the storage shelf and the plurality of processing machines, the conveyance device comprising:
• a carriage which moves between the storage shelf and the plurality of processing machines, and
• a local controller for controlling the carriage, wherein
• the local controller of the conveyance device is configured to:
• receive the standby signal from the main controller,
• move the carriage in accordance with a first traveling control parameter when the standby signal indicates that a plurality of conveyance requests are retained in the main controller, and
• move the carriage in accordance with a second traveling control parameter, which moves the carriage more slowly than when moved in accordance with the first traveling control parameter, when the standby signal indicates that a plurality of conveyance requests are not retained in the main controller.