
Vacuum control system of the KEK Photon Factory (PF) storage ring has been upgraded in the summer of 2004 for the first time since the PF ring operation started in 1982. The new vacuum control system is based on PLC (Programmable Logic Controller) and EPICS (Experimental Physics and Industrial Control System)[1]. The vacuum interlock system was also upgraded to the PLC-based system. With this upgrade, reliability, operability and maintainability of the vacuum control system were improved.
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