文档介绍：DVP-ES2 操作手册–程序篇
目录
1 PLC 梯形图的基本原理
PLC 扫描方法..............................................................................................................1-2
信号流向.......................................................................................................................1-3
常开, 常闭节点.............................................................................................................1-3
PLC 继电器和寄存器....................................................................................................1-4
梯形图符号...................................................................................................................1-5
创建一个 PLC 梯形图程序.........................................................................1-6
LD / LDI (常开或者常闭节点的载入) ...........................................................1-7
LDP / LDF (上升沿或者下降沿指令的载入) ................................................1-7
AND / ANI (常开节点或常闭节点的串接) ....................................................1-7
ANDP / ANDF (上升沿或下降沿节点的串接) ..............................................1-7
OR / ORI (常开节点或常闭节点的并接)......................................................1-8
ORP / ORF (上升沿或下降沿节点的并接) ..................................................1-8
ANB (区块串接) ..........................................................................................1-8
ORB (区块串接) ..........................................................................................1-8
MPS / MRD / MPP (Branch instructions 分支指令) ....................................1-9
STL (步进梯形程序) ..................................................................................1-10
RET (返回)................................................................................................1-10
梯形图和指令的转换................................................................................................... 1-11
梯形图的化