KB88835
Published: July 9, 2020
Revision: 3.0

Flag Lock/Unlock may cause controller to reset


Applies To:

Firmware for:

  • GRV-EPIC-PR1
  • SNAP-PAC-S1, SNAP-PAC-S1-FM, SNAP-PAC-S1-W
  • SNAP-PAC-S2, SNAP-PAC-S2-W
  • 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
  • SoftPAC

Versions Affected:

For GRV-EPIC-PR1 Firmware: All versions prior to 2.0.0
Form PAC firmware: All versions prior to 10.3b

Resolved In Version:

GRV-EPIC-PR1 firmware: 2.0.0
PAC firmware: 10.3b


Symptoms:

In a PAC Control strategy, the Flag Lock and Flag Unlock commands may result in the controller or processor locking up or resetting when other logic in the strategy or an HMI sets the value of the 32-bit integer used as the Flag Lock/Unlock variable and you do one of the following:

  • You attempt to stop the strategy.
  • You attempt to download a strategy (which stops the existing strategy).

Workaround:

Use a special name for the 32-bit integer variable used as the flag variable for the Flag Lock/Unlock commands to make it obvious what they are used for. Never use any command other than Flag Lock or Flag Unlock on these variables and don't set or clear them from an HMI.

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.

Copyright © 2020 Opto 22. All rights reserved.