回复:400plc两个dp口的区别？-技术论坛-工业支持中心-西门子中国

回复:400plc两个dp口的区别？

Zane

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钻石如何晋级?

发布于 2011-06-01 12:23:33

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quote:以下是引用小釉在2011-05-31 17:58:33的发言：

quote:以下是引用Zane在2011-05-31 12:17:45的发言：
1.MPI/DP口只支持DPV0的协议；DP口支持DPV1的协议
2.MPI/DP口的支持站点数少于DP口的站点数

关于第一条我又做了一下测试
cpu414-2dp
双击第一和第二个dp口的属性
在operating mode 中，我发现dp mode 都可以选择dpv1

这说明这两个口都支持dpv1

另外在dp mode中还有S7 compatible，S7 compatible一般在什么情况下选择，应该怎么理解？和dpv1有什么区别?
zane 能够解释一下吗

查了下手册，的确现在都支持DPV1了

DP mode

Modules which support the operating mode DPV1 give you the option of selecting "S7 compatible" and "DPV1" mode. As a rule, you should choose "DPV1" mode. In "DPV1" mode, all SIMATIC DP slaves are addressed in their mode ("S7 compatible" or "DPV1").
Set "S7 compatible" mode in the following situations:

?In an existing system, an "S7 compatible" DP module is replaced with a "DPV1" DP module. In this case, if you select "DPV1" mode, you may also have to modify the user program.

?The existing PROFIBUS subnet contains third-party DP slaves that cannot handle "DPV1" mode. In this case, it cannot be ensured that these DP slaves are addressed in the correct mode.

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