Rockwell Automation Publication 1756-RM100F-EN-P - October 2018 129
Instruction Execution Chapter 6
Manually Set Math Overflow
You can use overflow flags to help debug your code. Create math overflow
conditions where appropriate in your code.
If you used an OTE or OTL instruction to set the overflow flag (S:V), the
instruction did not always generate a minor fault with 5570 and 5370
controllers.
When you use an OTE or OTL instruction to set the overflow flag (S:V), the
instruction causes an overflow minor fault with 5580 and 5380 controllers:
The fault occurs regardless of the state of the flag before the instruction was
executed.
This implementation affects the OTE and OTL instructions.
Mitigation
N/A
Language Affected
Ladder Logic (RLL) Yes
Structured Text (ST) No
Function Blocks (FBD) No
Sequential Function Chart (SFC) No
5580/5380 Controllers 5570/5370 Controllers
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