1746-OA16
1746-OA16
1746-OA16
尽管梯形图与继电器电路图在结构形式、元件符号及逻辑控制功能等方面相类似，但它们又有许多不同之处，梯形图具有自己的编程规则。
1）每一逻辑行总是起于左母线，然后是触点的连接，***后终止于线圈或右母线（右母线可以不画出）。注意：左母线与线圈之间一定要有触点，而线圈与右母线之间则不能有任何触点。
2）梯形图中的触点可以任意串联或并联，但继电器线圈只能并联而不能串联。
3）触点的使用次数不受限制。
4）一般情况下，在梯形图中同一线圈只能出现一次。如果在程序中，同一线圈使用了两次或多次，称为“双线圈输出”。对于“双线圈输出”，有些PLC将其视为语法错误，***不允许；有些PLC则将前面的输出视为无效，只有***后一次输出有效；而有些PLC，在含有跳转指令或步进指令的梯形图中允许双线圈输出。
5）对于不可编程梯形图必须 经过等效变换，变成可编程梯形图。
6）有几个串联电路相并联时，应将串联触点多的回路放在上方，如图5-2a所示。在有几个并联电路相串联时，应将并联触点多的回路放在左方，如图5-2b所示。这样所编制的程序简洁明了，语句较少。
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