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KB55161
SNAP-PAC-R1 may report incorrect digital or quadrature counts
Revision:  2.0
Published:  3/7/2007
Applies To
SNAP-PAC-S1 Controller Firmware
Versions
Problem affects versions:  
R7.0a – R7.1h
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

Example A

10 10 10

20 40 Counts error > actual increase 20 25 Counts error < actual increase

30 30 Counter value decreased 30 30 Counter did not decrease

RESOLUTION

Opto 22 has resolved 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

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