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KB84444
SNAP analog output module resets when invalid float is written to it
Revision:  1.0
Published:  11/25/2015
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
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.

Relevant Downloads
No relevant downloads have been specified.
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Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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