Opto 22

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KB56192
Null pointers assigned to any I/O point may eventually cause a controller reset
Revision:  2.0
Published:  7/9/2007
Applies To
Firmware for:
SNAP-PAC-S1
SNAP-PAC-R1
SNAP-PAC-R2
SNAP-UP1-ADS
SNAP-UP1-M64
SNAP-UP1-D64
SNAP-LCE
Versions
Problem was discovered in version:  
R7.1h
Problem is resolved in version:  
R8.0a SNAP PAC firmware
Problem is resolved in version:  
R7.2d Ultimate I/O firmware

SYMPTOMS

Using an un-initialized pointer (null pointer) to any type of analog/digital, input/output point, may eventually cause a controller to reset.

For example, in this Move to Pointer instruction, if pMyDigitalOutput is null and is assigned to a “digital output point” pointer, a -69 error (“Invalid parameter (null pointer) passed”) is correctly reported in the controller error queue. However, eventually the controller may reset.

CAUSE

The resources used during the attempted assignment are not released properly and could eventually cause a controller reset.

WORKAROUND

Be sure to assign a value to a pointer before assigning it to an I/O point, such as when it is used with a digital or analog point command.

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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