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The control systems of all neutron scattering instruments implemented by theJ\"ulich Centre for Neutron Science (JCNS) are based on Siemens PLC technology.Historically PROFIBUS has been used for the communication of PLCs withsupervisory computers, decentral periphery systems and other PLCs. Today,PROFINET IO is the most commonly used industrial real time Ethernet system andnaturally supported by Siemens PLC systems. As a consequence, all new neutroninstruments of JCNS are based on PROFINET IO. For the interfacing tosupervisory computers based on CompactPCI, a CompactPCI carrier board forPC/104-Plus mezzanines has been developed, allowing the transparent use of theSiemens PC/104-Plus PROFINET IO controller CP1604 in CompactPCI systems. Linuxis used as the operating system for supervisory computers and the softwaredevelopment employs the PROFINET IO-Base-API, commonly supported by SiemensPROFINET IO controllers. On top of this API, an application protocol for thecommunication with PLC-based motion systems has been implemented.

Application of PROFINET IO in Neutron Scattering Instruments