1794-IB10XOB6
1794-IB10XOB6
1794-IB10XOB6
当通讯初始化时，计数器的值选通为 1 ，以后就逐次累加 1 ，就得到了新计数器的值。
3 PLC 故障的显示
将 PLC 控制系统的故障信息及时显示出来并报警，有利于检修时迅速找到故障点并展开工作；将故障信息的存档则有利于系统的长期维护和历史追述。
PLC 系统的故障信息一般存储在数据块（ DATA BLOCK ）中，如何通过增加外设来与此进行通讯或数据交换呢？通常情况下可采用以下几种：
2 直接利用该 PLC 的 CPU 上 RS232 － C 、 RS422 － A 、 RS485 标准接口，直接编程与普通工业 PC 电脑的串行口（ COM1 、 2 ）通讯，并安装 “ 组态王 ” 等工控软件。组态王目前的版本具有双机热备功能、加快 OPC 通讯速度、报警组从 32 个增加到 512 个优点。其报警历史数据可与 EXCEL 通讯，非常适合管控一体化。
2 直接利用 PLC 的编程口或在 PLC 系统中增加一块通讯卡，与触摸屏或文本显示器连接。它的优点具有具有报警列表功能，逐行实时显示当前报警信息。
备货，备货，降降降，火火火，火火火……
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