KB84444
Published: November 25, 2015
Revision: 1.0

SNAP analog output module resets when invalid float is written to it


Applies To:

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
SNAP-PAC-EB1
SNAP-PAC-EB1-FM
SNAP-PAC-EB1-W
SNAP-PAC-EB2
SNAP-PAC-EB2-FM
SNAP-PAC-EB2-W
SNAP-PAC-SB1
SNAP-PAC-SB2

Versions Affected:

Problem affects: Firmware - all versions


Symptoms:

If an invalid float is written to a SNAP analog output module, the module resets. In PAC Manager, the Module - Times Discovered count will increase with each occurrence.

Workaround:

An invalid floating point value can occur with a divide-by-zero math calculation, or it can occur when reading an analog input that is not accessible to the brain. Be sure to check the voltage as measured at the rack and also downstream of the fuse on the rack to make sure it is 5.00 to 5.20 VDC. You can also use the PAC Control condition "Float Valid?" to verify a floating point value before writing it to an analog output.

Resolution:

Opto 22 is investigating this issue.

Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com


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