使用搜索功能查看 Kepware 的信息库,其中包含 500 多篇知识库文章。缩小搜索结果范围,或在下面的搜索字段中输入您的查询。

或者,如果您无法找到解决方案,我们还有另一个资源:我们的 PTC eSupport Portal。 如果系统提示您登录 eSupport Portal,您可以使用“我的 Kepware”凭据。需要一个“我的 Kepware”帐户吗?在此处创建

搜索解决方案结果:
View All Solutions

Kepware Knowledge Base: Solution


Siemens Device Returning Protocol Error [Class=0x81, Code=0x04]


Last Update: 2018/11/7
Problem:
The Event Log displays the error message, "Unable to read # bytes starting at offset 0 for <requested tag> on device <channel.device>. Device returned protocol error [Class=0x81, Code=0x04]."

Possible Cause:
The controller's Protection settings are directly related to protocol error [Class=0x81, Code=0x04]. If the Protection settings match the "Access Level" and "Permit access with PUT/GET communication from remote partner" options specified in the Siemens TCP/IP Ethernet Driver product manual, then the controller's memory (that is, the SIMATIC memory card) may need to be reset.

Solution:
Reset the controller's memory and then download the S7 project. At that point, the Siemens TCP/IP Ethernet Driver should be able to access the controller's memory.

Note:
For more information, refer to "How To Configure S7-1500 Connections" in the Siemens TCP/IP Ethernet Driver product manual.