KB55161
Published: March 7, 2007
Revision: 2.0

SNAP-PAC-R1 may report incorrect digital or quadrature counts


Applies To:

SNAP-PAC-S1 Controller Firmware

Versions Affected:

Problem affects versions: R7.0a – R7.1h
Problem is resolved in version: R8.0a

Resolved In Version:

Problem is resolved in version: R8.0a


Symptoms:

Digital inputs configured as counters or quadrature counters on SNAP-PAC-R1s, may report the wrong counter value. The counter value may temporarily (for one digital scan period) reflect a value that is too high by up to 255 counts.

The problem corrects itself during the next digital scan. The correction may cause the counter value to decrease if the error is at least the same as the increase in counts (Example A). The corrected value may also not show a decrease if the error is off by less than the increase in counts (Example B). The following is an example:

Example A Example B

Actual Counter Actual Counter


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


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