Opto 22

43044 Business Park Drive, Temecula, CA 92590 USA
Local & outside the USA:(951) 695-3000
Toll-Free within the USA:(800) 321-6786
Fax: (951) 695-3095
Email: sales@opto22.com
 
KB80629
Controllers accessing Ethernet brains via high-latency radio network may reset
Revision:  2.0
Published:  9/23/2009
Applies To
Firmware for:
SNAP-PAC-S1
SNAP-PAC-S2
SNAP-PAC-R1
SNAP-PAC-R2
Versions
Problem was introduced in version:  
R1.0a
Resolution is included beginning in version:  
B8.5a, build date August 14, 2009, 9:12 am
Problem is fixed in version:  
R8.5a

SYMPTOMS

A SNAP-PAC control engine communicating to an Ethernet brain over a radio modem (or a wireless device with a high latency response time such as a cellular modem), may reset because of the delay in receiving a response from the brain. If the control engine sends a command and does not receive a response from the brain within the configured timeout period set up in the strategy, then the control engine retransmits the message. When responses to the original and retransmitted request are received by the controller, the conditions are set up for the reset to occur.

An example of a SNAP-PAC Ethernet system with radio modems:

A SNAP PAC control engine is connected via Ethernet to a radio modem.  At a remote location, a radio modem is connected over Ethernet to a SNAP PAC Ethernet brain.

WORKAROUND

Increase the timeout period for a response from the brain to the controller. From PAC Control configure mode, select Configure→I/O, highlight the I/O unit, and click Modify to display the Edit I/O Unit dialog.  Change the Timeout value and click OK to complete the change. Click OK again to close the remaining windows. The image below shows the timeout setting for an I/O unit.

RESOLUTION

This problem has been fixed.

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

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 © 2016 Opto 22. All rights reserved.

My.Opto22

All Opto22

Request Information
  • FREE Product Brochure
  • Product Demonstration
  • PreSales Engineering Assistance

Opto 22 Product Support

Opto 22 Product Support is FREE Monday through Friday 7 a.m. to 5 p.m. Pacific Time

Product Support Numbers:

Local: (951) 695-3080
Toll-Free: (800) 835-6786
Fax: (951) 695-3017
support@opto22.com

Products

None

Downloads

None

Documents

None