描述
PLC在早期只是用来存储执行逻辑运算、顺序控制、定时、计数和运算等操作的指令;并通过数字输入和输出操作,来控制各类机械或生产过程。这种特性导致他一般用于较小的自控场所,且拓展性并不强。
REVERE AIRCRAFT ELECTRONIC WEIGHING KIT P/N: C-55800325
Enlarge
Richmond 37 x 58in. Screen Print SM3758
3.8 L V-6 Jeep Engine and Automatic Transmission
TPTE1298701144?, PO4892474AA. 38JK, AA, 474
Enlarge
Fafnir Super Precision Angular Bearing 3MM9126WI CR FUL
Wells Index Vertical Mill Model 847
Bijur Spraymist Coolant System Kwik Switch II