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Koehler, W.     [Köhler, W.]

Paper Title Page
WEZ03 A configurable Interlock System for RF Stations at XFEL 159
  • M. Penno, W. Köhler, H. Leich, B. Petrosyan, G. Trowitzsch, R. W. Wenndorff
    DESY Zeuthen, Zeuthen
  • S. Choroba, T. Grevsmühl
    DESY, Hamburg
  The interlock system prevents any damage from the cost expensive components of the RF station. The system monitors various system components, computes the status in-formation in realtime and reports actual status to the control system. The system is designed for maximum reliability and max. time of operation. It includes self diagnostic and modular repair strategies. The interlock incorporates a controller and slave modules that perform the I/O opera-tion. They are connected to distribution panels that supply flexible interfaces to exter-nal components. The interlock logic is implemented in hardware and operates independ from the proc-essor and the software. The software accomplishes the hardware selftest on system startup. Further applications provide communication interfaces over Ethernet used by administration and the controlsystem. A runtime software integrity selftest strategy has been implemented for high reliability. It covers detection of stack overflows, thread deadlocks, memory corruption and is able to recover the system without inter-rupting interlock operation. The interlock system performs well its task at FLASH (DESY, Hamburg Site) and at PITZ (DESY, Zeuthen Site).  
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