Dear Marty,
I note that EN61131-2 was listed in the OJ under the EMC directive on
December 6, 1995. By that light, you should comply with its requirements
as long as you are subject to the EMC directive (ie you're not a
subassembly without a direct use).
Jon D. Curtis, PE
Curtis-Straus LLC [email protected]
One-Stop Laboratory for EMC, Product Safety and Telecom
527 Great Road voice (508) 486-8880
Littleton, MA 01460 fax (508) 486-8828
http://world.std.com/~csweb
On Wed, 11 Jun 1997, Martin Ginty wrote:
> Sorry about the previous attempt!! I hit the send button by accident!
> *********************************************************************
>
> Dear All,
>
> hopefully one of you out there can help me with this,
>
> My company has recently been contacted by an organisation stating that
> our product (programmable logic controller) should comply with the
> requirements of EN61131-2 (the standard for programmable logic
> controllers) as it is listed on the OJ for the Low Voltage Directive. No
> problem with that, we already comply with the safety aspects of this
> standard. However, they also think that we should test to and satisfy
> the functional requirements as well as the safety requirements. To my
> knowledge LVD is concerned with the safety of circuits operating at
> voltages above 50VAC or 75VDC. The directive states that the safety
> requirements only need to be met and most of the standards listed on the
> OJ for this directive are applicable to the safety requirements portions
> only. Also at the beginning of EN61131-2 it states that this standard
> takes precedence over all other standards EXCEPT basic safety standards.
> EN61131-2 isn't actually a safety standard as such, it covers design and
> definition of PLC systems as well as design requirements for circuits
> operating within the voltage ranges that fall within the scope of the
> directive (and a whole bunch of other stuff I don't want to go into!).
> However, as many of the circuits within a PLC system are SELV they don't
> fall within the scope of the directive.
>
> Is there any justification for this organisation to demand this?
> Am I missing something here?
>
> Best regards
>
> Martin Ginty
> Mitsubishi Nagoya Works
> FA systems department
>
