The old BEPC storage ring magnet temperature protection system was finished and put into use in 1988. The protection system controlled 32 sets of power supplies and protected 162 magnets of the storage ring. Some defects were exposed during last 12 years especially the way of relay control. The upgrade is implemented via programmable controller which takes a key role in the protection control system. The hardware configuration, the software design and test of the new system are discussed in the paper.
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