ALSTOM NRD108033 8RDC44667G01 SA44667.C 电源控制器

ALSTOM NRD108033 8RDC44667G01 SA44667.C 电源控制器

1、每个继电器的线圈和它的触点均用同一编号，每个元件的触点使用时没有数量限制。

2、梯形图每一行都是从左边开始，线圈接在右边（线圈右边不允许再有接触点〉，如图(a)错，图(b)正确。

3、线圈不能直接接在左边母线上。

4、在一个程序中，同一编号的线圈如果使用两次，称为双线圈输出，它很容易引起误操作，应尽量避免。

5、在梯形图中没有真实的电流流动，为了便于分析PLC的周期扫描原理和逻辑上的因果关系，定在梯形图中有“电流”流动，这个“电流”只能在梯形图中单方向流动―一即从左向右流动，层次的改变只能从上向下。

1. The coil of each relay and its contacts are numbered with the same number, and there is no limit on the number of contacts of each component when used.

2. Each row of the ladder diagram starts from the left, and the coil is connected to the right (no more contact points are allowed on the right side of the coil), as shown in figure (a) is wrong, and figure (b) is correct.

3, the coil can not be directly connected to the left bus.

4, in a program, the same number of the coil if used twice, called double coil output, it is easy to cause misoperation, should be avoided as much as possible.

5, there is no real current flow in the ladder diagram, in order to facilitate the analysis of PLC periodic scanning principle and logical causality, set in the ladder diagram there is a "current" flow, the "current" can only flow in the ladder diagram in a single direction - that is, from left to right flow, the level of change can only be from top to bottom.