Opto 22

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KB84791
Heavy use of a file COM handle by multiple charts may cause the controller to reset
Revision:  2.0
Published:  12/10/2015
Applies To
SNAP-PAC-S1
SNAP-PAC-S1-FM
SNAP-PAC-S1-W
SNAP-PAC-S2
SNAP-PAC-S2-W
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
SOFTPAC
Versions
Problem affects:  
Firmware - All versions
Problem is fixed in version:  
PAC Firmware R9.4c

SYMPTOMS

If a COM handle is used by multiple charts and is accessed frequently by those charts, hardware control engines may reset, and SoftPAC may queue a Bus Error (-16).

The reset or bus error will occur if one chart closes a COM handle while another chart is in the middle of using it. The chart that is still using it may not know it is closed and try to use the now-invalid handle. 

WORKAROUND

Use a flag variable in the strategy to synchronize the COM handle.

RESOLUTION

Opto 22 has resolved this issue.

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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