1756-L7X vs 1756-L8X

[brianschriver]

Those L8's really are impressive. On one application I converted I also got about 35x improvement, on the other one I got about 15x.

I'm looking forward to the PLd Safety version of that coming out that doesn't need a safety partner.

-Benaiah

Benaiah - You'll be pleased to learn that 5580S (L8S) is available for sale as of about two weeks ago. Both the PLd / SIL2 single slot version and the safety partner (to get PLe / SIL3) are shipping!

 

[brianschriver]

Having heard about the Intel quad core in the new L8 series processors...
I took a program I have been developing in my bench L73 and dumped it in the new L81E and this is the difference in scan time. Simply incredible.

For clarification, the processor in the 5580 (L8) and 5380 is NOT an Intel chip. It is an RA designed quad core processor.

 

[Contr_Conn]

Just to clarify: 5480 controllers will have Intel Processor once released.
http://ab.rockwellautomation.com/programmable-controllers/compactlogix-5480

 

[user123456]

I have not, nor probably will not, ever get my hands on one to play with, let alone use in a running application. So I am somewhat envious of you. Do please enjoy your privileged position.

Their specification, I remember, touted an impressive improvement scan time over their predecessors - up to 20x improvement in the standard task. A possible 200us I/O update time was also advertised.

If we take your Max Scan times for the same Task as an example, that is roughly 35x faster. That is quite impressive.



On the quad-core front, just a small but important distinction to make - They are achieving these remarkable improvements by virtue of the fact that there are multiple dedicated processor cores available, more so than actually using all available cores to achieve such scan times. Other controller tasks, such as motion, unconnected messaging and CIP communications do not impact upon the program tasks as they also have dedicated cores available...

These controllers with memory will utilize the new ICE2 ASIC as their host CPU. The ICE2 ASIC has a quad-core Cortex-A9 architecture which will allow for separation of main logic execution from auxiliary functions such as communications and packet processing. This equipment utilizes three cores of the ASIC.

If you want to view more statistical and diagnostic data for your controller then you can open its built-in web pages via a web browser. These controllers use these web pages instead of the Logix5000 Task Monitor. The scan times are also available there.

Another tidbit to add - If you convert a project from say an L7 to an L8, then you cannot convert back. They are too incompatible as the controller architectures are completely different. I hope you saved an L7 copy of your test project should you still need it!

To view some more impressive sample improvement task times take a look at this promotional video which I remember viewing some time ago...

ControlLogix 5580 Performance

It compares the L7 and L8 platforms, which is quite pertinent to the thread title.


Regards,
George

Hi George, can you please provide additional details regarding the L8 architecture.

 

[user123456]

I have not, nor probably will not, ever get my hands on one to play with, let alone use in a running application. So I am somewhat envious of you. Do please enjoy your privileged position.

Their specification, I remember, touted an impressive improvement scan time over their predecessors - up to 20x improvement in the standard task. A possible 200us I/O update time was also advertised.

If we take your Max Scan times for the same Task as an example, that is roughly 35x faster. That is quite impressive.



On the quad-core front, just a small but important distinction to make - They are achieving these remarkable improvements by virtue of the fact that there are multiple dedicated processor cores available, more so than actually using all available cores to achieve such scan times. Other controller tasks, such as motion, unconnected messaging and CIP communications do not impact upon the program tasks as they also have dedicated cores available...

These controllers with memory will utilize the new ICE2 ASIC as their host CPU. The ICE2 ASIC has a quad-core Cortex-A9 architecture which will allow for separation of main logic execution from auxiliary functions such as communications and packet processing. This equipment utilizes three cores of the ASIC.

If you want to view more statistical and diagnostic data for your controller then you can open its built-in web pages via a web browser. These controllers use these web pages instead of the Logix5000 Task Monitor. The scan times are also available there.

Another tidbit to add - If you convert a project from say an L7 to an L8, then you cannot convert back. They are too incompatible as the controller architectures are completely different. I hope you saved an L7 copy of your test project should you still need it!

To view some more impressive sample improvement task times take a look at this promotional video which I remember viewing some time ago...

ControlLogix 5580 Performance

It compares the L7 and L8 platforms, which is quite pertinent to the thread title.


Regards,
George

Hi Geospark I would like to learn more L8 architecture. Do you have any documentation that I can refer to?. There isn't much from RA that explains the specifics about the architecture.