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
 
KB80396
Analog milliamp outputs clamped to an invalid value cause SNAP module to go off-line
Revision:  1.0
Published:  9/23/2008
Applies To
Firmware for:
SNAP-PAC-R1
SNAP-PAC-R2
SNAP-PAC-EB1
SNAP-PAC-EB2
SNAP-PAC-SB1
SNAP-PAC-SB2
SNAP-UP1-ADS
SNAP-UP1-M64
SNAP-UP1-D64
SNAP-B3000-ENET
SNAP-ENET-S64
SNAP-ENET-D64
Versions
Problem was introduced in version:  
R6.0a

SYMPTOMS

A SNAP analog output module assigned an Upper or Lower Clamp value outside its valid output range, is forced offline. The module cycles online and offline until valid clamp values are written. Depending on the application used to view the module's readings, a '-nan' or -32768 may be reported.

Modules affected:

SNAP-AOA-3 SNAP-AOV-5
SNAP-AOA-23 SNAP-AOV-7
SNAP-AOA-23-iSRC SNAP-AOV-25
SNAP-AOA-28

Example 1:

The following settings for a SNAP-AOA-3, 4-20 mA module cause the problem:
Output = 4 mA
Upper Clamp = 5 mA
Lower Clamp = 50 mA← This is out of range

Example 2:

The following settings for a SNAP-AOV-5, 0-10 VDC output module cause the problem:
Output = 0 VDC
Upper Clamp = 0 VDC
Lower Clamp = 25 VDC← This is out of range

Additional symptoms as seen from PAC Manager's Status Read page:

  • Smart Modules Present mask indicates the module is offline.
  • Times Discovered for the module increases.
  • Arcnet Reconfigs Detected does not show count as increasing.

The Upper and Lower Clamp values are entered in PAC Manager using this window: (Tools→Inspect, Point Config)

Likewise, the clamping limits may be entered in PAC Control:

RESOLUTION

Opto 22 is investigating this issue.

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