描述
根据PLC的程序扫描原则，PLC先左后右，先上后下的步序语句逐句扫描。当指令涉及到输入、输出状态时，PLC从输入映象寄存器中“读入”对应输入映象寄存器的当前状态，然后，进行相应的运算，运算结果再存入元件映象寄存器中，对元件映象寄存器来说，每一个元件会随着程序执行过程而变化。
CCI Electrical Dist. Junction Box 208V, 50A, 3-Phase
TEGAL Electrical Dist. Junction Box 208V, 25A, 3-Phase
CCI Electrical Dist. Junction Box 208V, 50A, 3-Phase
TEGAL Electrical Dist. Junction Box 208V, 40A, 3-Phase
TEGAL Electrical Dist. Junction Box 208V, 25A, 3-Phase
Leybold Pump Station Housing WS1001-100P
