描述
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。
MKS 0248A-01000SV GENERAL PURPOSE FLOW CONTROL VALVE
57701-481 DURANT DIGITAL BIDIRECTIONAL COUNTER NEW
TOTAL CONTROL QUICKPANEL JR. DATA HIGHWAY QPJ-ABD-201
OMRON DRT2-ROS16 REMOTE TERMINAL 24 VDC
PMI MOTION TECHNOLOGIES 0088056001 TYPE VXA 48-8-16
ELEKTRIM MOTOR 7.5 HP 460 VAC 254T FRAME 1180 RPM
50399 ALLEN BRADLEY DRIVER BOARD
KJ3001X1-BD1 FISHER ROSEMOUNT DI MODULE NEW IN BOX
FUGI ELECTRIC 250 AMP CIRCUIT BREAKER MODEL BU-KSB 600V
A16B-1210-0020 FANUC BOARD FOR RF NEW
ALLEN BRADLEY 1784-KTX SER. B COMMUNICATIONS INTERFACE
