Applies To:
  • CitectSCADA 5.4x, 5.5x, 6.xx
  • CitectHMI 5.4x, 5.5x, 6.xx
Summary:

I am losing communications intermittently between CitectSCADA and Honeywell PHD collectors.

CTAPI Errors 299 and 183 are showing in the PHD Event log. The system is under heavy load so I cannot run with CTAPI logging constantly turned on to trap CTAPI errors. Apart from the heavy loading, what could be causing these errors and communication failures.

 

Solution:

Error 183 means file already exists.
Error 299 means that o nly part of a ReadProcessMemory or WriteProcessMemory request was completed.

Network problems may be ameliorated by adjusting the timeout value as follows:

[IPC]
SocketSendTimeout=5000 (increase further only if necessary)

Also add the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters

DefaultSendWindow

Set it's original value to FC00 (hex), and increase this value until the problem no longer occurs. A reboot is required for the change to take affect.

 
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