描述
控制逻辑——继电器控制逻辑采用硬接线逻辑，利用继电器机械触点的串联或并联，及时间继电器等组合成控制逻辑，其接线多而复杂、体积大、功耗大、故障率高，灵活性和扩展性很差。而PLC采用存储器逻辑，其控制逻辑以程序方式存储在内存中，灵活性和扩展性都很好。
MI-T-M GC-2403-0MHB 5.5HP PRESSURE WASHER 2400PSI 81640
RHEEM RPNL-042JAZ 3.5TON 13 SEER SPLIT SYSTEM HEAT PUMP
RHEEM RPNL-042JAZ 3.5TON 13SEER SPLIT SYSTEM HEAT PUMP
CHAMPION COOLER 4001DD-N43/48D EVAPORATIVE COOLER 53789
DAYTON 36′ CABINET EXHAUST FAN/RPM 611 156894
CARRIER 50HQ-900531 LOOP CONTROLLER W/ C OPTION 146287
THERMO SCI BARNSTEAD LABLINE 95097 PREMIUM CONTROLLER
AVAYA HD-700009517-EXPO SYSTIMAX OPTICAL CABLE 156301
DAYTON 5VD79A 150,000 INFARED TUBE HEATER 152403
