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%.
Some units were inadvertently shipped with invalid I/O configuration data stored in EPROM/Flash.
Only modules configured with scaling exhibit the symptoms.
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.
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.
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.