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KB52733
Event timers on Ethernet I/O units begin counting down as soon as they are configured
Revision:  2.0
Published:  10/20/2006
Applies To
Firmware for:
SNAP-PAC-R1
SNAP-PAC-R2
SNAP-UP1-ADS
SNAP-UP1-M64
SNAP-UP1-D64
SNAP-B3000-ENET
Versions
Problem was discovered in version:  
R7.0a
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.

Relevant Downloads
No relevant downloads have been specified.
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Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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