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当前学科：PLC控制技术及应用
题目：
下面关于S7-200系列PLC的触点串联指令A、AN的叙述中正确的是: （ ）
A. C. AN常用于串联常闭触点。
B. B. A常用于串联常开触点。
C. A. A、AN指令用于单个触点的串联连接，串联的数不能超过5个。
D. D. 在OUT指令之后，可以通过串联触点对其它线圈进行驱动。
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