
Rockwell Automation Publication 1756-RM100F-EN-P - October 2018
115
Instruction Execution
Chapter 6
XPY Instruction
This implementation matches the industry standard behavior for raising X to
the power of Y.
Mitigation
N/A
0.0 div 0.0
The special case of a floating point divide of zero by zero now results in a NAN
value. Legacy controllers produced infinity.
This implementation affects the DIV instruction.
Mitigation
Inspect your applications for the Divide operation and correct accordingly.
Language
Affected
Ladder Logic (RLL)
Yes
Structured Text (ST)
Yes
Function Blocks (FBD)
Yes
Sequential Function Chart (SFC)
Yes
(1)
(1) Only affects embedded Structured Text.
5580/5380 Controllers
5570/5370 Controllers
Language
Affected
Ladder Logic (RLL)
Yes
Structured Text (ST)
Yes
Function Blocks (FBD)
Yes
Sequential Function Chart (SFC) Yes
(1)
(1) Only affects embedded Structured Text.
5580/5380 Controllers
5570/5370 Controllers
DIV(0.0, 0.0, dest) now produces NAN.
DIV(0.0, 0.0, dest) used to produce infinity.
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