SNAP PAC thermocouple modules running under R9.5a firmware may prematurely display high out-of-range value

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 Affected:

Problem was introduced in version: Firmware R9.5a
Problem is fixed in version: Firmware R9.5b

Resolved In Version:

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.

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.

Resolution:

Opto 22 has resolved this issue.

Questions?

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

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