KB52733
Published: October 20, 2006
Revision: 2.0

Event timers on Ethernet I/O units begin counting down as soon as they are configured


Applies To:

SNAP-PAC-R1
SNAP-PAC-R2
SNAP-UP1-ADS
SNAP-UP1-M64
SNAP-UP1-D64
SNAP-B3000-ENET

Versions Affected:

Problem was discovered in version: R7.0a
Problem is fixed in version: R7.1g

Resolved In Version:

Problem is fixed in version: R7.1g


Symptoms:

As soon as an event timer is configured, the timer begins counting down. When the I/O unit configuration is stored to flash, the active timer’s Time Remaining is stored to flash. When the I/O unit is restarted, the first event timer cycle uses the Time Remaining value instead of the Length of Delay.

Example: Two timers and a scratchpad bit are used to make a 20 second, 50% duty cycle square wave based on scratchpad bit 0 turning on and off. The square wave starts with a 300 second delay. Two timers, Timer #0 and Timer #1, are configured with the Length of Delay timer parameter set to 300000. As soon as Timer #0 is configured, the timer begins counting down. The timer continues to count down while Timer #1 is configured. Timer #1 also begins counting down.

When the I/O configuration is stored to flash, the current Time Remaining values are saved to their respective, active timers. When the I/O unit is restarted, the first timer cycle uses the Time Remaining value, instead of the Length of Delay.


Resolution:

Opto 22 has corrected this issue.


Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com


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