KB81514
Published: December 14, 2011
Revision: 3.0

Controller or serial brain becomes unresponsive after I/O communication on RS-485 serial link


Applies To:

SNAP-PAC-S1
SNAP-PAC-S2
SNAP-PAC-S1-W
SNAP-PAC-S2-W
SNAP-PAC-SB1
SNAP-PAC-SB2

Versions Affected:

Problem was introduced in versions: R8.3a SNAP-PAC-Sx
R8.1a SNAP-PAC-SBx


Problem is fixed in version: R9.1d

Resolved In Version:

Problem is fixed in version: R9.1d


Symptoms:

If a controller (type SNAP-PAC-S) is communicating to one or more serial brains (type SNAP-PAC-SB, or Mistic brains such as B3000 or B3000-B), then communication to the brains may be lost after the controller has been powered up for 49.7 days. If this occurs, the controller stops communicating on the serial port the brains are connected to, and the charts in the PAC Control strategy that communicate to the serial brains stop executing. If data from a serial brain is being scanned through the controller's host port, then the host port may lock up.

This bug may or may not occur, but it can occur at intervals of 49.7 days since powering up the controller.

When using a SNAP-PAC-SB brain, the brain can stop communicating after it has been powered up 49.7 days (or at intervals of 49.7 days).


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 © 2019 Opto 22. All rights reserved.