Description
状态继电器是PLC在步进顺控系统实现控制的重要内部元件。它与步进顺控指令STL组合使用,运用状态转移图,编制高效易懂的程序。状态继电器一般分为四类,其编号及点数如下:
初始状态:S0∽S9(10点);
回零:S10∽S19(10点);
通用:S20∽S499(480点);
保持:S500∽S899(400点);
报警:S900∽S999(100点);
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