ROL 和 ROR 功能均支持 1～256 个字的长度。循环位数必须大于 0，小于字符 串位数。 ROL 和 ROR 功能向右传递电流，除非循环位数大于字符串总长或小于 0。结 果存入输出 Q 中。如果希望输入串循环移位,则输出 Q 和输入 IN 应为相同内 存地址。只要该功能块得电，每次扫描均执行循环功能。
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