Hello, I'm currently working with a Citect OPC DA server and an Allen Bradley ControlLogix L71 PLC. I've configured my boards, ports, and I/O device. However, I'm encountering an issue: when testing communications using an OPC Client, I'm unable to perform a synchronous read. Despite this, I've verified with Studio 5000 that synchronous writes are successful. The error code I receive is 0x80004005, indicating an unspecified error. Both of my redundant servers exhibit the same behavior, even though all firewalls are disabled. Interestingly, my CompactLogix setup functions flawlessly. I'm running out of troubleshooting ideas to resolve this issue. Does anyone have any questions or suggestions? I have full administrative access to all the network switches connecting the two devices and can successfully ping the PLC from the server. Thank you, David
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Widelto suggested: Check out https://opcexpert.com/ for more information. Click to expand... Wow, I've never come across this resource before. Is it really free? Could anyone provide some background or history? Currently, I am utilizing two distinct OPC servers and have been doing so for the past five years. I am also in the process of integrating a new one, but it's causing some compatibility issues. Appreciate any insights in advance!
I experimented with OPCexpert and encountered several compatibility challenges on our systems, which operate on Windows 10 x64. Despite attempting to adjust the compatibility settings and execute the program as an administrator, the issues persist.
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Oops... forget about it. The program won't operate on a network drive. I transferred it to a local drive, and now it's functioning. I'm going to test it out now.
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Answer: - The issue is the inability to perform a synchronous read using an OPC Client with a Citect OPC DA server and an Allen Bradley ControlLogix L71 PLC, despite the ability to perform synchronous writes.
Answer: - The error code encountered is 0x80004005, which indicates an unspecified error.
Answer: - Yes, the user has disabled all firewalls, verified successful pinging of the PLC from the server, and confirmed that synchronous writes are successful. The issue persists across both redundant servers.
Answer: - Yes, the CompactLogix setup functions flawlessly, while the ControlLogix L71 setup faces issues with synchronous reads.
Answer: - The user has full administrative access to all network switches connecting the devices and can successfully ping the PLC from the server.
Answer: - Checking the OPC server and client configurations, reviewing any logs for more detailed error messages, and ensuring that all software and firmware are up to date might provide additional insights. Consulting
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