Iec 61131-3 Second edition 2003-01 Programmable controllers – Part 3: Programming languages

dependent parameters
as listed in annex D;
c)
shall be able to determine whether or not a user's language element violates any
requirement of this standard, where such a violation is not designated as an error in annex
E, and report the result of this determination to the user. In the case where the system does
not examine the whole program organization unit, the user shall be notified that the
determination is incomplete whenever no violations have been detected in the portion of the
program organization unit examined;
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61131-3 
 IEC:2003(E)
– 21 –
d)
shall treat each user violation that is designated as an error in annex E in at least one of the
following ways:
1)
there shall be a statement in an accompanying document that the error is not
reported;
2)
the system shall report during preparation of the program for execution that an
occurrence of that error is possible;
3)
the system shall report the error during preparation of the program for execution;
4)
the system shall report the error during execution of the program and initiate
appropriate system- or user-defined error handling procedures;
and if any violations that are designated as errors are treated in the manner described in
d)1) above, then a note referencing each such treatment shall appear in a separate section
of the accompanying document;
e)
shall be accompanied by a document that separately describes any features accepted by the
system that are prohibited or not specified in this standard. Such features shall be described
as being "extensions to the  language as defined in IEC 61131-3";
f)
shall be able to process in a manner similar to that specified for errors any use of any such
extension;
g)
shall be able to process in a manner similar to that specified for errors any use of one of the