Analog inputs configured as scalable, report a fixed value corresponding to 0 counts on serial B3000

Applies To:

B3000

Symptoms:

Analog input modules configured with custom scaling (OptoControl or ioControl), or engineering unit scaling (custom application communicating directly to I/O) in positions 8, 10, 12, and 14, may consistently report a scaled reading corresponding to 0 counts on serial B3000 I/O units.

Example 1: A SNAP-AIV (-10V to 10 V) module is configured for 0 to 10 V and scaled for 0 to 100%. The reading by the B3000 is always 0%.

Example 2: A SNAP-AIMA (-20 mA to 20 mA) module is configured for 4 to 20 mA and scaled for 0 to 100%. The reading by the B3000 is always –25%.

Workaround:

Clearing the serial B3000 EPROM corrects the problem. Modules without scaling do not exhibit the symptoms.

To clear the serial B3000 EPROM, refer to the following directions.

From OptoControl:

1. From OptoControl Debug mode, double-click the B3000 I/O units in the strategy tree.

2. Click the EEPROM Clear button.

If you are using a custom application in a Windows environment:

If you are experiencing the above symptoms and are using a custom application in a Windows environment, contact Opto 22 Product Support.

Resolution:

This problem was discovered September 29, 2005. Brains marked with a date code of 10/05 (October 2005) or newer, do not have this problem.

Questions?

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

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