描述
PLC外部驱动电路对于PLC输出不能直接带动负载的情况下，必须在外部采用驱动电路：可以用三极管驱，也可以用固态继电器或晶闸管电路驱动，同时应采用保护电路和浪涌吸收电路，且每路有显示二极管（LED）指示。印制板应做成插拔式
SYMMETRICOM 090-71000-02 TIMESOURCE2500 ST1 UN
Symmetricom XLi Time Frequency OCXO Master Clock 1PPS
TrueTime Symmetricom NTS-200 GPS Network Master Clock
TrueTime Symmetricom NTS-200 GPS Network Master Clock
TrueTime Symmetricom NTS-200 GPS Master Network Clock
Bancomm / Symmetricom PC03V VMEbus Time Code Processor
Datum/Symmetricom bc635VME Time&Frequency Processor,VME
TrueTime Symmetricom TimeVault GPS Network Master Clock
SYMMETRICOM 090-61010-01 SECURE7 HS OPT/LNG RCH
SYMMETRICOM 090-61010-01 SECURE7 HS OPT/LNG RCH
Bancomm / Symmetricom PC26V VME LED Display PCB
TrueTime Symmetricom NTS-200 Network Master GPS Clock
