Points 4 through 7 on a Snap-AICTD-8 always report °C

Applies To:

SNAP-PAC-R1
SNAP-PAC-R2

Versions Affected:

Problem was discovered in version: R8.2a
Problem is fixed in version: R8.5c

Resolved In Version:

Problem is fixed in version: R8.5c

Symptoms:

Points 4 through 7 on a SNAP-AICTD-8 module always report temperatures in degrees Celsius (°C), even if they are configured by a SNAP-PAC controller to report temperatures in degrees Fahrenheit (°F). Points 0 through 3 report temperatures correctly in both Fahrenheit and Celsius degrees.

The incorrect scaling for °F is shown below (Upper Scaled Units = 150, Lower Scaled Units = -273.0). This image shows the problem on point 4.

[image1]

Workaround:

Use PAC Manager to scale points 4 through 7 with the correct Upper and Lower Scaled Units to report temperatures in °F. Then store the values to flash so that they're not overwritten by the strategy when the strategy is started.

The correct °F scaling is shown below for point 0 on a SNAP-AICTD-8 module:

[image1]

Procedure:

Run PAC Manager.
Enter the controller IP address in the Device Name field and click Status Read. Verify you have a valid connection to the controller.
Click Point Config and click on the module number of your SNAP-AICTD-8.
Click in the Value field for the Upper Scaled Units.
Enter 302.0.
Click in the Value field for the Lower Scaled Units.
Enter -459.4.
Click Apply.
Click Status Write. The window shows the Status Write fields and Operation Commands.
Select the Store configuration to flash command and click on Send Command. The new scaled values are stored to flash memory and will not be overwritten by a PAC Control strategy.

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

DISCLAIMER

This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

OPTO 22 DOES NOT WARRANT THE COMPLETENESS, TIMELINESS, OR ACCURACY OF THE DATA CONTAINED IN THIS OPTOKB ARTICLE AND MAY MAKE CHANGES THERETO AT ANY TIME AT ITS SOLE DISCRETION WITHOUT NOTICE. FURTHER, ALL INFORMATION CONVEYED HEREBY IS PROVIDED TO USERS 'AS IS.' IN NO EVENT SHALL OPTO 22 BE LIABLE FOR ANY DAMAGES OF ANY KIND INCLUDING DIRECT, INDIRECT INCIDENTAL, CONSEQUENTIAL, LOSS PROFIT, OR DAMAGE, EVEN IF OPTO 22 HAS BEEN ADVISED ON THE POSSIBILITY OF SUCH DAMAGES.

OPTO 22 DISCLAIMS ALL WARRANTIES WHETHER EXPRESSED OR IMPLIED WITH RESPECT TO THE INFORMATION (INCLUDING HARDWARE, SOFTWARE, AND/OR FIRMWARE) PROVIDED HEREBY, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTIBILITY, AND NON-INFRINGEMENT. Note that certain jurisdictions do not sanction the exclusion of implied warranties: thus, this disclaimer may not apply to you.