Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 130)

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5.10.6 Errors Caused by the Negate Instruction
This error can occur when you are using the NEG instruction in a program. It is logged
in the error log.
If this error occurs: Then: Do the following:
The result of the
arithmetic calculation
is too large for Out.
ENO is set according
to ERROR_ENO, and
Out contains the
largest signed value
allowed for its data
type.
Make sure that the
negated value of In
falls within the
allowable range for
Out.