FPU_EXCEPTION_INFO¶
The Function Block FPU_EXCEPTION_INFO reads information which has been stored during an FPU exception. The reading operation takes 1 PLC cycle. If data are available, they are provided by setting the outputs DONE = TRUE and ERR = FALSE. If several errors have appeared up to the call of the Function Block, the last error is shown.
Note
This Function Block only has to be used with CPUs which have an FPU. The CPU parameter “Reaction on floating point exception” has to be set to “No failure”.
The following table represents an overview of the possible return values of the Function Block.
| EXCEPT_ERR | EXCEPT_TYPE | EXCEPT_TEXT |
|---|---|---|
| FALSE | 16#00 | “No error” |
| TRUE | 16#01 | “Zero Divide” |
| TRUE | 16#02 | “Overflow” |
| TRUE | 16#03 | “Underflow” |
| TRUE | 16#04 | “Invalid” |
| TRUE | 16#05 | “Inexact” |
| TRUE | 16#06 | “Function” |
The error “Function” occurs, if a result of a function (e.g. SQRT, LN or ACOS) cannot be calculated.
| Available as of PLC runtime system: | V1.2 |
| Included in library: | SysInt_AC500_V10.lib |
| Type | Function Block with historical values |