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.