blocks|key|74280|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|74281|如果PLC已经有此功能，为什么Simatic+PC站总是被添加为OPC服务器？|blockquote|74282|74283|74284|与其他工业通信协议相比，OPC+UA具有相当少的优势。通信是安全的/可以是安全的，项目是开放的(可以在GitHub上获得源代码，规范是免费的)，...|74285|74286|是否/如何与我的自定义客户端直接通信？(PLC上所需的任何编程)|74287|74288|74289|S7-1500与计算机之间的通信是OPC+UA端到端通信。我不知道S7-1500+OPC+UA服务器的规格，也不知道你的OPC+UA客户端，但我猜他们使用TCP上的OPC+UA二进制文件|74290|74291|对于“功能手册，10/2018，A5E03735815-AG+(第222页)”中定义的证书限制，什么是“最大可实现服务器方法数”、“最大参数数”、“最大服务器接口数”、“用户自定义服务器接口中的最大节点数”、“可加载服务器接口的最大尺寸”？|74292|74293|74294|您的配置可以包含OPC+UA方法。我猜西门子对方法的数量有一定的限制。每个方法中可用参数的数量相同。控制器中可用服务器接口的数量也有一些限制。|74295|74296|如何从我的申请中估计这些数字？|74297|74298|74299|我敢肯定你可以在你的西门子PLC手册中找到这些限制;)|74300|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|15|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|16|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|17|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|18|7|@]|8|@]|9|$]]|$1|H|3|-4|4|5|6|19|7|@]|8|@]|9|$]]|$1|I|3|J|4|C|6|1A|7|@]|8|@]|9|$]]|$1|K|3|-4|4|5|6|1B|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|1C|7|@]|8|@]|9|$]]|$1|M|3|N|4|5|6|1D|7|@]|8|@]|9|$]]|$1|O|3|-4|4|5|6|1E|7|@]|8|@]|9|$]]|$1|P|3|Q|4|C|6|1F|7|@]|8|@]|9|$]]|$1|R|3|-4|4|5|6|1G|7|@]|8|@]|9|$]]|$1|S|3|-4|4|5|6|1H|7|@]|8|@]|9|$]]|$1|T|3|U|4|5|6|1I|7|@]|8|@]|9|$]]|$1|V|3|-4|4|5|6|1J|7|@]|8|@]|9|$]]|$1|W|3|X|4|C|6|1K|7|@]|8|@]|9|$]]|$1|Y|3|-4|4|5|6|1L|7|@]|8|@]|9|$]]|$1|Z|3|-4|4|5|6|1M|7|@]|8|@]|9|$]]|$1|10|3|11|4|5|6|1N|7|@]|8|@]|9|$]]|$1|12|3|-4|4|5|6|1O|7|@]|8|@]|9|$]]]|13|$]]

<blockquote>
 Why the Simatic PC station is always added as OPC server if the PLC
 already has this feature?
</blockquote>

OPC UA has quite few advantages over other industrial communication protocol. The communication is/can be secure, the project is Open (Source available on GitHub, Specification are free), ...

<blockquote>
 Does/How PLC OPC server communicates directly to my custom client?
 (Any programming needed on PLC)
</blockquote>

The communication between your S7-1500 and your computer is an OPC UA End-to-End communication. I don't know the specification of the S7-1500 OPC UA Server neither your OPC UA Client but I guess they use OPC UA Binary over TCP 

<blockquote>
 For the certificates limitations as defined in "Function Manual,
 10/2018, A5E03735815-AG (page 222)", what means "Max number of
 implementable server methods", "Max number of arguments", "Max number
 of server interfaces", "Max number of nodes in user-defined server
 interface", "Max size of loadable server interfaces"?
</blockquote>

Your Configuration can contains OPC UA Methods. I guess there is some limit given by Siemens for the number of Methods. Same for the number of Arguments available in each Methods. There shall also be some limitation for the number of available Server interface in your controller.

<blockquote>
 How can I estimated these numbers from my application?
</blockquote>

I am pretty sure you can find those limitation in your Siemens's PLC Manual ;)

blocks|key|2795157|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2795158|如果PLC已经有此功能，为什么Simatic+PC站总是被添加为OPC服务器？|blockquote|2795159|2795160|2795161|不需要SIMATIC+PC工作站。在S7-1500+PLC拥有内置OPC+UA服务器之前，使用SIMATIC+PC工作站才能使OPC+UA服务器具有来自PLC的数据。SIMATIC+PC工作站是运行SIMATIC网络软件的计算机。SIMATIC网络软件可以通过S7连接与S7-1500通信，它读取的数据可以提供给OPC+UA/DA服务器，这些服务器也是SIMATIC网络软件的一部分。|2795162|2795163|是否/如何与我的自定义客户端直接通信？(PLC上所需的任何编程)|2795164|2795165|2795166|OPC+UA客户端必须在与PLC网络接口相同的IP范围内。在S7-1500的硬件配置中，启用了OPC+UA服务器。然后，OPC+UA客户端指向S7-1500+PLC的IP地址，并且使用OPC+UA发现将能够读取所有标记存储区、输入和输出存储区和数据块。如果需要，OPC+UA客户端将能够订阅标签和写入值。|2795167|编辑:可以在PLC中设置路由器地址，因此如果客户端在另一个子网上，则需要能够路由到PLC。|2795168|S7-1500不需要编程。在TIA+Portal中，只需访问PLC的硬件配置，在硬件设置中有启用OPC+UA服务器的选项。|2795169|2795170|对于“功能手册，10/2018，A5E03735815-AG+(第222页)”中定义的证书限制，什么是“最大可实现服务器方法数”、“最大参数数”、“最大服务器接口数”、“用户自定义服务器接口中的最大节点数”、“可加载服务器接口的最大尺寸”？|2795171|2795172|2795173|在OPC+UA中，可以调用方法。方法可以从PLC逻辑中调用函数代码。方法可以传递参数，也可以返回值。这就是规范在讨论方法和最大参数数量时所引用的内容。在OPC+UA中，每个数据点都被认为是一个节点，因此这解释了可以读取的最大数据点。由于不同的PLC标签占用不同的内存量，因此最大大小是所有节点的总大小。|2795174|2795175|如何从我的申请中估计这些数字？|2795176|2795177|2795178|这将取决于您希望从OPC+UA服务器共享的标签数量。订阅的更新速度和允许的订阅数量。没有硬性和快速的方法来计算它，它非常依赖于应用程序。|2795179|2795180|我的PC应用程序和可编程控制器之间是否需要第二次通信(例如TCP)来发送/接收重新配置数据？|2795181|2795182|2795183|OPC+UA服务器可以配置为监听S7-1500的任何网络接口。不需要额外的通信，它完全是OPC协议的一部分。|2795184|Siemens提供了一个很好的应用程序示例和附带的文档，可以帮助您入门。从下面的链接下载文档PDF。|2795185|https://support.industry.siemens.com/cs/us/en/view/109737901|offset|length|2795186|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1O|0|0^^$0|@$1|2|3|-4|4|5|6|1Q|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|1R|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|1S|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|1T|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|1U|7|@]|8|@]|9|$]]|$1|H|3|-4|4|5|6|1V|7|@]|8|@]|9|$]]|$1|I|3|J|4|C|6|1W|7|@]|8|@]|9|$]]|$1|K|3|-4|4|5|6|1X|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|1Y|7|@]|8|@]|9|$]]|$1|M|3|N|4|5|6|1Z|7|@]|8|@]|9|$]]|$1|O|3|P|4|5|6|20|7|@]|8|@]|9|$]]|$1|Q|3|R|4|5|6|21|7|@]|8|@]|9|$]]|$1|S|3|-4|4|5|6|22|7|@]|8|@]|9|$]]|$1|T|3|U|4|C|6|23|7|@]|8|@]|9|$]]|$1|V|3|-4|4|5|6|24|7|@]|8|@]|9|$]]|$1|W|3|-4|4|5|6|25|7|@]|8|@]|9|$]]|$1|X|3|Y|4|5|6|26|7|@]|8|@]|9|$]]|$1|Z|3|-4|4|5|6|27|7|@]|8|@]|9|$]]|$1|10|3|11|4|C|6|28|7|@]|8|@]|9|$]]|$1|12|3|-4|4|5|6|29|7|@]|8|@]|9|$]]|$1|13|3|-4|4|5|6|2A|7|@]|8|@]|9|$]]|$1|14|3|15|4|5|6|2B|7|@]|8|@]|9|$]]|$1|16|3|-4|4|5|6|2C|7|@]|8|@]|9|$]]|$1|17|3|18|4|C|6|2D|7|@]|8|@]|9|$]]|$1|19|3|-4|4|5|6|2E|7|@]|8|@]|9|$]]|$1|1A|3|-4|4|5|6|2F|7|@]|8|@]|9|$]]|$1|1B|3|1C|4|5|6|2G|7|@]|8|@]|9|$]]|$1|1D|3|1E|4|5|6|2H|7|@]|8|@]|9|$]]|$1|1F|3|1G|4|5|6|2I|7|@]|8|@$1H|2J|1I|2K|1|2L]]|9|$]]|$1|1J|3|-4|4|5|6|2M|7|@]|8|@]|9|$]]]|1K|$1L|$4|1M|1N|1O|9|$1P|1G]]]]

<blockquote>
Why the Simatic PC station is always added as OPC server if the PLC already has this feature?
</blockquote>
The SIMATIC PC station is not required. In the days before the S7-1500 PLC had a built in OPC UA server the only way to have an OPC UA server with data from the PLC was to use a SIMATIC PC station. A SIMATIC PC station is a computer running the SIMATIC NET software. The SIMATIC NET software can talk to the S7-1500 via an S7-Connection, the data it reads can be served to OPC UA/DA servers which are also part of the SIMATIC NET software.
<blockquote>
Does/How PLC OPC server communicates directly to my custom client? (Any programming needed on PLC)
</blockquote>
The OPC UA client must be on the same IP range as the PLC network interface. In the hardware configuration of the S7-1500 the OPC UA server is enabled. The OPC UA client is then pointed to the IP address of the S7-1500 PLC and using the OPC UA discovery will be able to read all the marker memory area, input and output memory area and data blocks. The OPC UA client will be able to subscribe to tags and write values if required.
EDIT: A router address can be set in PLC, so the client needs to be able to route to the PLC if on another subnet.
No programming is required in the S7-1500. In TIA Portal simply access the hardware configuration of the PLC and in the hardware settings there are options to enable the OPC UA server.
<blockquote>
For the certificates limitations as defined in &quot;Function Manual, 10/2018, A5E03735815-AG (page 222)&quot;, what means &quot;Max number of implementable server methods&quot;, &quot;Max number of arguments&quot;, &quot;Max number of server interfaces&quot;, &quot;Max number of nodes in user-defined server interface&quot;, &quot;Max size of loadable server interfaces&quot;?
</blockquote>
In OPC UA it is possible to call methods. Methods can call function code from within the PLC logic. A method can be passed parameters and can return values. This is what the spec is refering to when it dicusses methods and maximum number of arguments. Each data point is considered to be a node in OPC UA, so this is explaining the maximum data points which can be read. As different PLC tags take up different amounts of memory the max size is the total size of all the nodes.
<blockquote>
How can I estimated these numbers from my application?
</blockquote>
This will be depending on the number of tags you wish to share from the OPC UA server. The update speed on the subscription and the amount of subscriptions allowed. There is no hard and fast method for calulcating this, it is very application dependant.
<blockquote>
Do I need a second communication (TCP for example) between my PC application and PLC to send/receive reconfiguration data?
</blockquote>
The OPC UA server can be configured to listen on any network interface of the S7-1500. There is no need for extra communication it is all part of the OPC UA protocol.
Siemens provide a nice application example with accompanying documentation which may help you get started. Download the documentation PDF from the link below.
<a href="https://support.industry.siemens.com/cs/us/en/view/109737901" rel="nofollow noreferrer">https://support.industry.siemens.com/cs/us/en/view/109737901</a>

I'm little bit confused regarding how S7-1500 embeded OPC UA server communication works in case of a custom client installed on PC since all examples I've seen so far include a Simatic PC Station as OPC server!!!

On PLC side, I have S7-1511-1PN with OPC UA server activated. This PLC is connected over PROFINET to ET200SP+several AI modules.

On PC side (not Simatic PC Station), I have an application in which there is some kind of OPC UA client functionnality that reads inputs from AI modules, writes some tags on PLC and if necessary sends reconfiguration records of AI modules to PLC (reconfiguration via user program).

What I can't understand, is:

Why the Simatic PC station is always added as OPC server if the PLC already has this feature?

Does/How PLC OPC server communicates directly to my custom client? (Any programming needed on PLC)

For the certificates limitations as defined in "Function Manual, 10/2018, A5E03735815-AG (page 222)", what means "Max number of implementable server methods", "Max number of arguments", "Max number of server interfaces", "Max number of nodes in user-defined server interface", "Max size of loadable server interfaces"?

How can I estimated these numbers from my application?

(Yes/No) Do I need a second communication (TCP for example) between my PC application and PLC to send/receive reconfiguration data?

how S7-1500 OPC UA server communicates with custom client

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我对S7-1500嵌入式OPC UA服务器如何在PC上安装自定义客户端的情况下的通信工作方式感到有点困惑，因为到目前为止我看到的所有示例都包括作为OPC服务器的Simatic PC Station！在PLC端，我激活了S7-1511-1PN和OPC UA服务器。该可编程逻辑控制器通过PROFINET连接到ET200SP...

问S7-1500 OPC UA服务器如何与自定义客户端通信
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