PLC:
The development from switch quantity control to sequence control and transportation processing is from bottom to top
Multifunction such as continuous PID control,PID is in the interrupt station.
One PC can be used as the master station,and multiple PLCs of the same type can be used as slave stations.
It is also possible to use one PLC as the master station and multiple PLCs of the same type as slave stations to form a PLC network.This is more convenient than using a PC as the master station:when there is user programming,it is not necessary to know the communication protocol,just write it in the format of the manual.
A PLC grid can be used either as a standalone DCS or as a subsystem of a DCS.
PLC：
从开关量控制发展到顺序控制、运送处理，是从下往上的
连续PID控制等多功能，PID在中断站中。
可用一台PC机为主站，多台同型PLC为从站。
也可一台PLC为主站，多台同型PLC为从站，构成PLC网络。这比用PC机作主站方便之处是：有用户编程时，不必知道通信协议，只要按说明书格式写就行。
PLC网格既可作为独立DCS，也可作为DCS的子系统。
PLC主要用于工业过程中的顺序控制，新型PLC也兼有闭环控制功能。
ALLEN BRADLEY 7300-UIB1 634174 CONTROL BOARD GOOD TAKEO
ALLEN BRADLEY 872CPN4NP12-E2 SER A INDUCTIVE PROXIMITY
ABB (ASEA DSQC 103) YB161102-AD/1 GOOD TAKEOUT!
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PASS & SEYMOUR 7813-P CONTROL SWITCH ~~NIB
GE CR7ZCL SPECTRA 700 DC OPERATED CONTACTOR ~ in box
PIZZATO FL-2083 FL2083 SWITCH ~ IN BOX
GE TEY 2 POLE 60 AMP 480Y/277 VAC 250 VDC
FANUC A16B-1212-0360 /01 ROBOT MASTER BOARD
