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KB48091
Analog inputs configured as scalable, report a fixed value corresponding to 0 counts on serial B3000
Revision:  3.0
Published:  4/21/2006
Applies To
Firmware for:
B3000
Versions

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%.

CAUSE

Some units were inadvertently shipped with invalid I/O configuration data stored in EPROM/Flash.

Only modules configured with scaling exhibit the symptoms.

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.

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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This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

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