Opto 22

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KB83725
Error (-434) when trying to read controller's message queue
Revision:  1.0
Published:  6/24/2014
Applies To
PACCONTROLBAS
PACCONTROLPRO
PAC Terminal
PAC Terminal SSD
Versions
Versions affected:  
PAC Control R9.3c and earlier
  
PAC Project 9.4003

SYMPTOMS

While using the PAC Control debugger, if you try to read the controller's message queue you may get error -434, which says the following:
"Opto Error
The control engine is in use by another process on this computer, or may be unreachable.
Code: -434"

RESOLUTION

Opto 22 has resolved this issue.

WORKAROUND

Close PAC Control (or at least get out of Debug mode). Open PAC Terminal and inspect the controller's message queue. The key is to make sure that PAC Control (on that computer) is not communicating with the controller and that no other instances of PAC Terminal are communicating with the controller (on that computer). If there is only one instance of PAC Terminal open on that computer, it should be able to read the controller's message queue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

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