Development of OPT-VME boards towards the unification of optical-linked remote I/O system at SPring-8

SPring-8 control system employs a large number of optical-linked remote I/O boards for the purposes of noise immunity enhancement, concentration of input/output signals and so on. At present, we utilize four kinds of optical-linked remote I/O systems, NIO, MTC-UDC, RIO and OPT-VME, due to the different construction phases of the accelerators. NIO and MTC-UDC used in the booster are already unavailable because they are discontinued. Then we will replace them using OPT-VME system developed by SPring-8. We have developed two kinds of new OPT-VME boards. One is a substitute remote board of NIO for the booster steering magnet power supplies. By changing the FPGA logic, the new remote board will also work as a substitution of the RIO Type-A remote board for the storage-ring steering magnet power supplies. The other is a 1:11 multiplexer board to enhance channel density of the OPT-VME system. The multiplexer board can be also used as a 12 ports VME master board. The successful development shows the unification capability of the optical-linked remote I/O systems at SPring-8. (author)