  A 70 GeV Proton Synchrotron Extracted Beam Lines Control System is described.
About 130 Magnet Dipoles and Quadrupoles, 20 Correction Magnets, 50 Beam
Collimators, BPM equipment spread over 1 Km have to be controlled. The old
System was based on the PDP-11/40 and LSI-11 compatible computers and the MIL
1553 STD as a Field Bus. It successfully operated about 15 years. A new system
includes home made Equipment Controllers based on I 8051 Processors, CAN Field
Bus, FECs, Servers, Consoles connected by Ethernet. On the first stage of
modernization PDPs and LSIs are replaced with PCs connected by Ethernet.
Equipment controllers are being successfully tested in the Collimators and
Corrector Magnets Controls during a run.
