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KB84243
Custom-scaled SNAP I/O modules may be reset to defaults
Revision:  2.0
Published:  12/10/2015
Applies To
SNAP-PAC-EB1
SNAP-PAC-EB1-FM
SNAP-PAC-EB1-W
SNAP-PAC-EB2
SNAP-PAC-EB2-FM
SNAP-PAC-EB2-W
SNAP-PAC-SB1
SNAP-PAC-SB2
SNAP-PAC-R1
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
Versions
Problem affects:  
All versions through R9.4b
Problem is fixed in version:  
PAC Firmware R9.4c

SYMPTOMS

If you have SNAP I/O modules with custom scaling, you may see a module lose its scaling and revert to default scaling. If you then inspect the Status Read area of the brain or rack-mounted controller on the same rack as the module, you will note that the I/O module has been discovered multiple times, and probably also that 1 or 2 Arcnet reconfigs have been detected.

This issue may occur if an analog module resets several times in a row, so it is important to diagnose why the module is resetting. One common cause is low voltage (below 5.00 VDC) at the rack.

WORKAROUND

Check periodically for lost custom scaling and reconfigure when it is lost.

More importantly, determine why the module resets. Check voltage at the rack (measure and adjust the voltage downstream of the fuse on the rack). Voltage should measure between 5.00 and 5.20 VDC.

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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