Support OPC Server
Question: If the plant reacts too slowly, how can i speed it up ?
Answer: Often the reason are a lot of long fields or error texts or recepture fields. This things are needed in the SCADA software only if the error or field condition changes. Normally this is true if the error index is changing. The SCADA software is registering the ling text for changing, a standard OPC server polls the long data for changes. Registering the data after the condition is changing will be too slowly also. This results in a heavily network load.
The solution for this: Define under "tables" "Wizard long data" a new optimizing. Call it "Error texts". Select the error index in group 1. In group 2 choose the long error text. The alias name which redirects the existing OPC item to the optimized element is created automatically.
Question: How Wonderware InTouch can use OPC ?
Answer: Please use this documentation. It can be found in the download area and in the manuals also.
Question: How the OPC server recognizes program changes
in Rockwell CompactLogix and ControlLogix ?
Answer: The OPC Server checks each ten seconds for changes in the controller. If a change is detected it reorganizes internally all necessary things. But it is preferred not to write into the controller if the controller data elements are changed frequently. Reading data is secure always.
Is there a way reaching OPC UA only devices with an OPC DA client ?
Answer: Yes. Please create in the Tani OPC server a connection to Your OPC UA device. In Your OPC DA client You will reach Your device normal with browsing: Tani OPC server, next is the connection to Your device. The rest works as normal as in other browsing.
How i can tunneling Windows OPC DA over networks without DCOM ?
Answer: With the OPC tunnel which is a build in feature in all Tani OPC servers. The faster OPC protocol for this is OpcPipe, you can use OPC-UA also.
Question: How the OPC DA Core Components can be reinitialized or removed completely?
Answer: For reinitializing or removing of the OPC Core Components it is important that no software ist using them. This is handled by the batch file "OpcUr.cmd". The file should be copied to c:\Windows\SysWOW64. Please open a command prompt as administrator. Change into the directory with cd c:\Windows\SysWOW64 . The file knows a command line parameter -r which unregisters the components and registers them again, no files are removed with this parameter set. Some dialogs are shown, confirm them please. There may happen errors if the files are in use. A reboot of the computer may solve this. If not please stop the program which is using the components and remove the affected files by hand. After this for security issues it is recommended rebooting the computer again. A new installation of the Tani OPC Server or the PLC Engine will reinstall and reinitialize the OPC Core Components correctly. All OPC DA software of other manufacturers will work again also. All effects with the OPC DA components with access privileges now are fixed.
Question: How can i use OPC with Microsoft Excel ?
Answer: Please use this example.
Frage: The OPC UA station search does not work ?
Antwort: Under Windows the Bonjour service version 2.0 need to be installed, additionally the UDP port 5353 need to be opened in the firewall.
Under Linux the avahi daemon need to be present. You will find it in the packet manager of your distribution. The UDP port 5353 need to be opened in the firewall.
Please do not install multiple OPC UA discovery servers on the same machine.
If you try using an external discovery server mostly the certificates need to be proved. Ask the discovery servers manufacturer for details.
Question: How do i connect to a S7 200 ?
Answer: Please use this example. One data block only extsts, it has the number 1.