COMM_REQ要求所有命令数据在执行之前以一-个正确的顺序(在-一个命令块里)放在CPU存储器中。COMM_ REQ应该通过一-个单触发线圈的触点来执行，防止多次发送数据。用于COMM_ REQ功能的操作数和命令块格式的详细资料
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