Error OBs

[rajCNC 0]

Dear All,

Please anyone help me to understand. 

I am very new to Schneider platform, i am working with Siemens platform .

* Please let me know there is any provision to add error OBs like, OB121,OB122 in siemens.

 

Thanks&Regards,  

[cHud 25]

I Also dont know Siemens. What is an OB?

 

[Quant 21]

OB is operation block.

Schneider don't speak about DB, FC and OB.  Schneider speak about EF - elementar functions, DFB - derivate function blocks and data

I think  OB Siemens = DFB Schneider

[Crossbow 294]

Sounds like a function or function block to me.

[acpi 11]

Hi,

OB means organization Block, it can't be compared with Schneider DFB. OB121 and OB122 are specials organization blocks that can be used to avoid to stop the processor when a programming error occurs (OB121) or I.O error (OB122). So don't look at this on Schneider Plcs, they don't exist so you don't need it :)

JC

 

Edited 19 Mar 2018 by acpi

[Quant 21]

use online help and search for %S and %SW - by using system bits /words you can setup if the PLC should stop

Edited 19 Mar 2018 by Quant

[acpi 11]

You're right, some Schneider plcs system bits could be used to "emulate" some OB, but in this particular case it's not really interesting. With a Siemens Step7 Plc, if you address a memory area that doesn't exist, your plc will stop. If you add OB121 (that is not present by default when you create your project) it will not. It's really a totally different philosophy between Siemens and Schneider and it's not a good idea to try to do with a Schneider plc what you did with a Siemens.

JC