SEMITRON SPP-7K800
SEMITRON SPP-7K800
SEMITRON SPP-7K800
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参数化比较温度
为什么在某些情况下,保留区会被重写?
在STEP 7的硬件组态中,可以把几个操作数区定义为“保留区”。这样可以在掉电以后,即使没有备份电池的话,仍能保持这些区域中的内容。如果定义一个块为 “保留块”,而它在 CPU 中不存在或只是临时安装过,那么这些区域的部分内容会被重写。在电源接通/断开之后,其他内容会在相关区里找到。
26:为何不能把闪存卡的内容加载入S7 300 CPU?
你的项目在闪存卡上。现在要用它加载 S7 300 。但加载结束后发现 CPU 的 RAM 中仍是空的。 出现此问题的原因是你的程序里有无法处理的,"错误的"组织块(比如说, OB86 没有 DP 接口)。 在重新设置和重新启动 CPU 后, RAM 仍是空的。 诊断缓冲区对这个"无法加载"的块会提示一些信息。
27:当把 CPU315-2DP 作为从站,把 CPU315-2DP 作为主站时的诊断地址 在组态一个 CPU315-2DP 站时,你使用 S7 工具 “H/W CONFIG” 来分配诊断地址。如果发生一个故障,这些诊断地址被加入诊断 OB 的变量 “OB82_MDL_ADDR” 里。 你可在 OB82 里分析此变量,确定有故障的站并作出相应的反应。 下面是如何分配诊断地址的例子:
* 1 步: 通过 CPU315-2DP 组态从站并赋予一个诊断地址,比如 422。 * 2 步: 通过 CPU315-2DP 组态主站
* 3 步: 把组态好的从站链接到主站并赋予一个诊断地址,比如 1022。
28:需要为S7-300 CPU的DP从站接口作何种设置,才可以使用它来进行路由选择? 如果使用CPU作为I-Slave,并且该CPU也起S7 路由器的作用,那么请注意如下事项: 用于路由选择的从站的DP接口必须设置为活动状态。这可以在HW
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