Personnel Safety System Status Reporting Via EPICS at the
Advanced Photon Source

S. J. Stein
Experimental Facilities Division, Argonne National Laboratory


The Personnel Safety System (PSS) for an experimental beamline at the Advanced Photon Source uses a dual-chain, PLC-based architecture for controlling shutters and experimental stations. Reporting the status of these two chains is important from both an operational and diagnostic standpoint. This paper discusses the methods used for passing information from both chains of the PSS to the EPICS-based control system at the APS.