KB88018
Published: April 16, 2019
Revision: 2.0

groov Digital Output On-pulse or Off-pulse Performs Inconsistently


Applies To:

Firmware for GRV-EPIC-PR1

Versions Affected:

1.0.0 through 1.3.0

Resolved In Version:

1.3.1


Symptoms:

When using the PAC Control commands Start On-Pulse or Start Off-Pulse, digital output pulsing performs inconsistently on the following modules:

  • GRV-OAC-12
  • GRV-OACI-12
  • GRV-ODCI-12
  • GRV-ODCSRC-24
When using the PAC Control command Start On Pulse or Start Off Pulse, you may observe these issues with the pulsed output:
  • Symptom #1—The I/O channel sometimes does not pulse.
  • Symptom #2—The I/O channel may display undesirable behavior such as a lengthened pulse when you use the Set TPO Period, Set TPO Percent, or Generate N Pulses command at approximately the same time as either the Start On-Pulse or Start Off-Pulse command.

Workaround:

For symptom #1, use chart logic to replicate the functionality of the Start On-Pulse and Start Off-Pulse commands. For example, turn ON (or OFF) the I/O channel, then delay the desired amount of time, and then the turn OFF (or ON) the channel.

For symptom #2, ensure that Start On Pulse (Start Off Pulse) does not run concurrently with changing TPO parameters or Generate N Pulses. If possible, move the I/O channel that is changed by TPO parameters or Generate N Pulses to a different module.

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 © 2019 Opto 22. All rights reserved.