Re: [4diac-dev] Timeliterals in Lua

[Martin Melik-Merkumians <Melik-Merkumians@xxxxxxxxxxxxxxxxx>]

The IEC 61131 way would be to raise an error flag if an overflow occurs. Any further steps are vendor specific 😉

 

Von: 4diac-dev-bounces@xxxxxxxxxxx <4diac-dev-bounces@xxxxxxxxxxx> Im Auftrag von Jan Holzweber
Gesendet: Freitag, 12. Juli 2019 15:13
An: 4diac-dev@xxxxxxxxxxx
Betreff: Re: [4diac-dev] Timeliterals in Lua

 

Just out of curiosity and error handling, if this should be handled when generating the lua code or just ignored, because it will not happen anyway :)

Cheers,

Jan

 

Gesendet: Freitag, 12. Juli 2019 um 15:06 Uhr
Von: "Martin Melik-Merkumians" <Melik-Merkumians@xxxxxxxxxxxxxxxxx>
An: "4diac developer discussions" <4diac-dev@xxxxxxxxxxx>
Betreff: Re: [4diac-dev] Timeliterals in Lua

Don’t think so 602 years of timespans should be quite rare. Why do you ask?

 

Best,

Martin

 

Von: 4diac-dev-bounces@xxxxxxxxxxx <4diac-dev-bounces@xxxxxxxxxxx> Im Auftrag von Jan Holzweber
Gesendet: Freitag, 12. Juli 2019 15:04
An: 4diac-dev@xxxxxxxxxxx
Betreff: Re: [4diac-dev] Timeliterals in Lua

 

Hi,

Ok, i will convert to nanoseconds then.
Do overflow errors often occur with 64-Bit? I mean it could store time values up to 5277777 hours.

Cheers,

Jan

 

Gesendet: Freitag, 12. Juli 2019 um 14:21 Uhr
Von: "Martin Melik-Merkumians" <Melik-Merkumians@xxxxxxxxxxxxxxxxx>
An: "4diac developer discussions" <4diac-dev@xxxxxxxxxxx>
Betreff: Re: [4diac-dev] Timeliterals in Lua

Hi,

 

we have a similar discussion currently running in https://bugs.eclipse.org/bugs/show_bug.cgi?id=549172

I would suggest for ease of use and consistency to save all TIMEs in nanosecond resolution. Interactions between LUA and C code will be than easiest to implement.

 

Best

Martin

 

Von: 4diac-dev-bounces@xxxxxxxxxxx <4diac-dev-bounces@xxxxxxxxxxx> Im Auftrag von Jan Holzweber
Gesendet: Freitag, 12. Juli 2019 14:11
An: 4diac-dev@xxxxxxxxxxx
Betreff: [4diac-dev] Timeliterals in Lua

 

Hello All!

I have a question regarding time and in which unit we should convert time literals from structured text into lua variables.
I already talked with Alois about this. He said in CPP he would do somethink like: CIEC_TIME().fromNanoSeconds(60E9). Should we aim to convert all times also into nanoseconds in Lua or should we do a different approach?

Cheers,

Jan
 

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