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IC693ACC336
码使用指定的7 位或8 位二进制数组合来表示128 或256 种可能的字符,MODBUS协议有两种传输模式,ASCII和RTU模式, 本次变频器采用ASCII模式传输信号, 上一章的HMI控制变频器采用的就是RTU模式。因此采用ASCII模式, 所以数据格式M8161选择8位数据模式。
PLC程序
程序大致分为4部分:
5.1 变频器功能说明
采用ASCII模式传输数据,在 ASCII 模式中,帧头为“:”(“0x3A”),帧尾缺省为“CRLF”(“0x0D”“0x0A”)。在 ASCII 方式下,除了帧头和帧尾之外,其余的数据字节全部以 ASCII 码方式发送,先发送高 4 位位元组,然后发送低 4位位元组。ASCII 方式下数据为 8 位长度。对于‘A’~‘F’,采用其大写字母的 ASCII 码。此时数据采用 LRC校验,校验涵盖从从机地址到数据的信息部分。校验和等于所有参与校验数据的字符和(舍弃进位位)的补码。
IC693ACC336
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IC693ACC336
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