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KB86139
SNAP PAC thermocouple modules running under R9.5a firmware may prematurely display high out-of-range value
Revision:  2.0
Published:  8/11/2016
Applies To
SNAP-PAC-R1
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R1-B
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 was introduced in version:  
Firmware R9.5a
Problem is fixed in version:  
Firmware R9.5b

SYMPTOMS

NOTE: This issue affects SNAP PAC brains running firmware R9.5a with thermocouple modules configured for point types C, D, E, G, J, K, or N. Point types B, R, S, T are not affected by this issue.

When nearing the a value in the upper range for its point type, the thermocouple modules listed below prematurely display out-of-range (either -32768, which is the default 16-bit out-of-range value, or a custom out-of-range value that was configured by using PAC Manager's Status Write page).

For example, a SNAP-AITM-i configured for K-type thermocouple will display out-of-range for an input of about 660 C°. (Normal range for this point type is +1372 to -270 C°.)


The temperatures in this table are approximations.

Once the input is roughly equivalent to the value in the Premature Out-of-Range Limit column, the brain returns the out-of-range value for the remaining upper range of the point type.

If the input drops below the threshold, the brain displays the correct value.

RESOLUTION

Opto 22 has resolved this issue.

WORKAROUND

If your thermocouple modules are affected by this issue, you can downgrade your brain's firmware from R9.5a to R9.4c or lower.

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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