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KB80374
'Get & Restart Period' command returns zero for period measurement
Revision:  2.0
Published:  12/5/2008
Applies To
Firmware for:
SNAP-PAC-R1
SNAP-PAC-R2
SNAP-PAC-EB1
SNAP-PAC-EB2
SNAP-PAC-SB1
SNAP-PAC-SB2
Versions
Problem was discovered in version:  
R8.2a
Problem is fixed in version:  
R8.3a

SYMPTOMS

The Get & Restart Period command may return a 0 even after the Get Period Measurement Complete Status command returns a true response, and is used to determine if the period measurement is complete. The period measurement is not actually complete, and results in a partial period measurement (or a 0).

WORKAROUND

Add a delay after the Get & Restart Period command, and before the next Get Period Measurement Complete Status command. The delay should be the Digital Features Scan Interval value + 1 ms. Use PAC Manager to inspect this value with Tools→Inspect, Status Write. For an I/O unit with a 1 ms delay as shown below, the delay would be 2 ms.

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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