SiePortal

The integrated platform for your product selection, buying and support workflow - bringing together Industry Mall and Online Support.

Products & Services
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
MySiePortal MySiePortal
{{(apiData.MySiePortal | filter:{'rank':1}:true)[0].title}} MySiePortal
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Cart ({{apiData.CartCount}})

Navigation

minimum execution time for ob33 in s7414

3/16/2016 4:12 PM	Rate (0)
Ziemens Gold Member Joined: 3/2/2007 Last visit: 1/23/2026 Posts: 1004 Rating: (5)	what is the minimum execution time for an ob33 or ob35 used in s7414 cpu? can we reduced it to 1 ms and do some logic in the ob33 without having the cpu producing faults (like overflow or other...)? thanks
	... thank you ...
Suggestion To thank Quote Answer

Posts: 5521

Rating:

(1058)

hi Ziemens,

see the technical Data of your CPU.

I chose this one for example:

OB
● Number, max.		see instruction list
● Size, max.		64 kbyte
● Number of free cycle OBs		1; OB 1
● Number of time alarm OBs		4; OB 10-13
● Number of delay alarm OBs		4; OB 20-23
● Number of cyclic interrupt OBs		4; OB 32, 33, 34, 35 (shortest cycle that can be set = 500 µs)
● Number of process alarm OBs		4; OB 40-43
● Number of DPV1 alarm OBs		3; OB 55-57
● Number of isochronous mode OBs		3; OB 61-63
● Number of multicomputing OBs		1; OB 60
● Number of background OBs		1; OB 90
● Number of startup OBs		2; OB 100, 102
● Number of asynchronous error OBs		9; OB 80-88
● Number of synchronous error OBs		2; OB 121, 122