DS3800HACB
DS3800HACB
DS3800HACB
2．输出阶梯设计图7b为输出阶梯，其结构与图4b相同，只是辅助继电器编号不同而已。
结束语
上述4种PLC顺序控制系统设计方法的共同特点是：
（1）由输入继电器控制辅助继电器（包括由置位/复位指令和移位指令定义的辅助继电器），按此构成步进阶梯；
（2）由辅助继电器控制输出继电器，以此构成输出阶梯；
（3）无论步进阶梯还是输出阶梯，都是很有规律的回路结构。不管要设计的顺序控制系统有步，也不管其输入输出点数有，只要弄清各种设计方法所设计的步进阶梯和输出阶梯的回路结构的规律性，根据设计依据，套用其中任一种设计方法的回路结构，就能快速地一次设计出较复杂的PLC顺序控制系统。
＆ 公司全称 ： 厦门泰尼电气有限公司
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＆ 公司地址 ： 厦门市海沧区海沧街道滨湖一里7号
＆ 公司网址 ： www.xmtaini.com
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