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[SOLVED] Request validation FB according to standard [message #1792417]

Tue, 17 July 2018 14:14

Agostino Mascitti

Messages: 15
Registered: May 2018

Junior Member

Hello,

I have been trying to understand whether this FB (an orchestrator of FBs) would comply to the standards. Is there any source with naming conventions and restrictions for events and inputs/outputs? Am I forced to use REQ/CNF couples?

Thank you in advance!

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[Updated on: Tue, 17 July 2018 15:09]

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Re: Request validation FB according to standard [message #1792421 is a reply to message #1792417]

Tue, 17 July 2018 15:02

Alois Zoitl

Messages: 1585
Registered: January 2014

Senior Member

Hi,

you are rather free in naming your events and data interface elements. The only rule is that they have to be valid IEC 61131-3 identifiers (roughly: upper and lower case letters, _, numbers, and maybe some more) 4diac automatically checks and let you only create valid names.

I always encourage people to use names that best conveys their intention. However there are some names defined in the standard that have special meaning and potential users of your FB would expect a certain behavior. These are INIT, INITO, REQ, CNF, RSP, IND as well as QI and QO. They are described in the standard in clause 6. In my IEC 61499 book there is also a section dedicated to these definitions.

For example in your FB's interface I'm a bit confused that QI and QO are withed all input and output events respectively.

Cheers,
Alois

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