A413222 METSO 地址元件数量和效验

Description

[注]上述中：1、”PLC号”系统默认为”FF”；2、”首地址”应以十进制表示，如首地址”X0018″表示从X寄存器的第18地址单元开始读取I/O量；3、”数量”表示读取的I/O量个数；4、”和效验”是指从”站号”到”数量”之间的各代码的ASCII码的累加和；5、PLC侧的响应码中”和效验”是指从”站号”到”EXT”之间的各代码的ASCII码的累加和。6、可以读出”X”、”Y”和”M”寄存器的内容。

例如：要读出站号为0的Fx2n系列PLC的X00到X08共9点的状态值，延时100ms,假设采用Communication Format(D8120)的Format 1方式：:

注释:请求站号PLC号命令延时元件首地址元件数量和效验

代码:ENQ 0 0 F F B R A X 0 0 0 0 0 9 4 2

ASCII码:05H 30H 30H 46H 46H 42H 52H 41H 58H 30H 30H 30H 30H 30H 35H 34H 32H

您只要将以上兰色部分的代码以字符串形式（VB中可以表示为CHR(5)&”00FFBRAX00000942″）发送到PLC，就会有正确的回应信息，如下：

注释:头站号PLC号元件首地址尾和效验

代码:STX 0 0 F F 0 0 1 1 0 1 1 0 1 EXT 0 5

ASCII码:02H 30H 30H 46H 46H 30H 30H 31H 31H 30H 31H 31H 30H 31H 03H 30H 35H

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