Tech Fred

The response is a single byte. You should be getting back a response with 10 data bytes 3 header bytes and 2 trailing check sum bytes. Similar to the following: [01h] [03h] [0Ah] [00h] [01h] [00h] [02h] [00h] [03h] [00h] [04h] [00h] [05h] [24h] [CFh]

The OPC Client that is connected to the OPC Server will tell it the rate that it wants updates sent to it. The industry standard is one second. Now, if the barcode scanner is sending the barcode to the OPC Server unsolicited, that means the server is not sending a request to scan to the scanner, Then you can probably set the update rate in the client to something faster because the server is just sending what it has in cache to the connected OPC Client.  What is the server and the client that is being used. That will allow us to refine our recommendations to you.

Get a serial to Ethernet converter  and use the Ethernet Encapsulation Option in the Modbus Serial Driver to connect to the Modbus device. That leaves you Serial port on the PC open.

Well the TI405 were re-branded Koyo (Direct Logix)405 series controllers and the TI 305 is the re-granded Koyo(DL 305). The TI 505 were Texas Instrument controllers, that is where TI comes from. You should be able to use Automation Directs Direct Soft software to program it.

You have the device in the server configuration set to simulated mode. This forces the Server to do a loop back on the device and you are now only reading from cache and not going out to the device at all. If you were to write to a tag you would see the value returned in the client but it would not be written to the physical device just to the cache that is allocated for that tag. Un-check that setting and you should start talking to the device. it the device is not responding you will get an error in the server for that. You may also want to consider updating to a newer server version. V4. is no longer sold or supported by Kepware/PTC.

Most likely the problem is with DCOM. OPC DA uses DCOM for security so you have to make sure that the user running the DA client has access and launch privileges with the DA Server. We have found over the 20 plus years that we have been dealing with DCOM that you can have 2 PC's configured with the exact same OS image and that you can get an OPC DA connection on one PC and not the other. This is one of the many reasons so many people are adopting OPC UA over DA. It has better security and you do not have to deal with DCOM. Check with the DA client or sever vendors should have documentation their DCOM recommendations. The OPC Training Institute has some good resources for this as well.

No, None of the Devices yu have listed have an OPC UA Server Embedded on them. If they have Ethernet ports on them you would be able to connect to them with drivers in KEPServerEX However Serial Protocols typically only allow one master connection and that is the HMI's in your configuration. If the HMI's have the ability to server their data then you might be able to connect to the HMI's using one of the Kepware Client Drivers, this allows KEPServerEX to become and OPC DA/UA/XMLDA/DDE/Wonderware Intouch bridge. I would recommend contact Kepware and talking to one of the Sales Application Engineers and they can help you determine what you can do. No support contract is needed to talk to them.

Greetings,  Are you manually adding the item request or did you browse to the UA  Server in the S7-1500 and Generate the item that you want to read from the dievice? Did the ATG succeed? What version of the server are you using? We do have a lot of users that are doing this successfully. Have you contacted Kepware Technical Support about this?

Check your power settings. The USB port is most likely powering down.

So, if you are doing an OPC DA connection to RSLinx on the Windows 10 PC you may be getting impacted by the Meltdown and Spectre Vulnerabilities that Microsoft sent security updates out. These would have happened on or after 1/3/2018. These updates broke most OPC Classic processing. Microsoft release updates to these to fix the breaks last Friday. 

Have you tried a Double Precision Float. It will get a higher value range and greater precision. I know that the logix controllers support the type.

KepserverEX has the Datalogger plug-in for logging data. This can be done with several different triggers. For accessing the SQL data the ODBC Client driver can be used. That driver has the ability to connect to a stored procedure, supply some inputs and get a single line response. You can also do a query from it to get data. Contact Sales@kepware.com and took to one of the sales application engineers and they can walk you through the entire process and answer any questions.

There is not gateway functionality in the Siemens controller so you will have to get the data from PLC1 into PLC 2.

You will need to do an OPC connection to the gateway. Remote DDE connections (NetDDE) are no longer supported by Microsoft. To do OPC DA or UA from Excell or access you are going to need and add-in for Excel. Try OPC Labs.com this is not free like DDE is though. I believe that Matrikon also has a solution as well.

The Automation wrapper is quite old and no longer supported by the OPC Foundation. Your best bet is to get an OPC Client SDK that allows you to develop an OPC Client in VB.Net or C#. There are several of them out there. ClientAce from Kepware (http://www.kepware.com/Products/OPC_ClientAce.asp) Unified Automation (http://www.unified-automation.com/products/client-sdk.html) TechnoSoftware (https://opcfoundation.org/products/view/85)