The present invention provides enhanced serial communication reliability in a situation where a plurality of cell controllers and a battery controller are daisy-chained to form a serial communication configuration. An extension member extends from the gripping structure. In association, a searching section 7 checks whether or not the message contains a caller’s name correspondent with name data previously stored in RAM 6. The portable concrete plant further includes conveying systems for conveying the components from the storage regions and from the slurry mixer to a system discharge port. During the period until a barrier layer is formed having also a function of improving tight adhesion, it is possible to ensure sufficient tight adhesion of wiring members and prevent peel-off of the wiring members.