Citect 7.2 client freezing

Question

One of my customer who has a Citect system as the following drawing, there are 4 computers, 1 server and 3 clients, version 7.2, most likely running in windows 10 PC. It is reported the manifold HMI intermittently freezes, as customer described, the Citect client application didn't freeze, but stopped updating tag reading and writing. This issue can be quickly fixed by restarting the computer, but it would recurs after a while. In addition, when Manifold client is freezing, the other two clients, PCN2 and PT HMI still work normally. This problem occurs not only on Manifold client, also on the other two Citect clients with less chance. Any insights or solutions regarding this issue would be greatly appreciated. Thank you.

Jacky Lang · Accepted Answer

The frozen or not responding client is often caused by the Citect main thread being blocked. You need reviewing your project configuration. 
 
 SQL Cicode functions without sleeps 
 ActiveX control 
 
 In addition, perform kernel dumps before and after the issue occurs. You need taking a look at the kernel dump files and identify anything abnormal. You can start with 
 
 Master Control Block 
 Table Master_Table 
 Other tables, such as Cicode 
 
 Hope this would help.

Citect 7.2 client freezing

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