Published: October 5, 2011
Incorrect scaled analog output XVAL when strategy is initially run
Problem was discovered in version: R9.1b
A scaled analog output module's XVAL is initially incorrect until a command in the PAC Control strategy writes to the analog module.
For example: A SNAP-AOV-23 has the Lower Scaled value set to 4mA (Actual) = 0% (Scaled) and the Upper Scaled value set to 20mA (Actual) = 100% (Scaled). When the strategy is initially run and the point is not manipulated by the strategy, the XVAL value for the point is 4% of the scaled value instead of 0%. When the strategy writes any valid value between 0% to 100%, the module output XVAL begins to report the value correctly.
To work around this problem, after the Upper Scale Units or Lower Scale Units is changed, store the configuration to flash with PAC Manager. Next, reset the I/O unit with PAC Manager or turn the unit off and on. This causes the unit to immediately use the Lower Scale Value setting.
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