Standardization of stepping motor control system in J-PARC linac and RCS

J-PARC Linac and RCS Profile Monitor (Wire Scanner), RCS Collimator, etc. are devices consisting of moving parts (wire of profile monitor, absorber / scatterer of collimator) and driving part. In these devices, the movable portion is moved to an appropriate position by the driving portion, and the movable portion is brought into contact with the beam, thereby measuring the beam shape and reducing the beam loss. Therefore, in order to move the movable part to an appropriate position without damaging it, proper control of the stepping motor used for the driving part is important. Many of the control system hardware of these drive units are used since the early days of J-PARC operation, and there is concern about malfunctions due to aging. In addition, since both VME and PLC are used as controllers, it is necessary to prepare spare parts of both control equipment in maintenance and management. Besides, the control logic differs depending on the kind of controller, VME or PLC. Therefore, maintainability of both hardware and software is an important issue. Then, we decided to proceed with updating the drive unit control system which standardized control system hardware and software. In this paper, the standardization of stepping motor control system in Linac and RCS is detailed. (author)