Use this variable to check for overflow conditions.
If you are not in V6 exception mode, the value of sysVar.overflowIndicator is undefined and there is no guarantee that it is meaningful.
After detection of an overflow condition, sysVar.overflowIndicator is not reset automatically. You must include code in your program to reset sysVar.overflowIndicator to 0 before performing any calculations that can trigger overflow checks.
You can use sysVar.overflowIndicator in the following ways: