Excellent features of Siemens which AB Control Logix Does not have

Lucky123

There is no comparison of RSView with WINCC.

I have never seen anyone who likes to work with RSView.

nickephx

I recently wrote an article explaining some of the practical differences between Siemens and Allen Bradley (AB), especially focused on function blocks.

Check it out here:

Siemens vs Allen-Bradley: Function Blocks

Hope this is informative.

Nick

DMC, Inc.

Expert Engineering & Software Services

www.dmcinfo.com

I think Don Sigman's post is exact right. AB tops S7 as far as being easy to use.

Takethe simple example of moving an INT value from an HMI and moving it into a PLC timer preset, which is a VERY COMMON procedure in the world of automation. In an AB PLC, it can be done with a simple MOV instruction in ladder logic, moving the INT right into the .PRE of the timer. In a S7-300 PLCwith ladder logic, you have toconvert the INT to BCD and then do a masked move with the time base you want and place the result in a MW/DW. How complex for such a common task! PLus, the Siemens methodis limited from 0-999 at the HMI and the S7-300 cannot convert DINT to TIME using the T_CONV. Now the S7-1200 can do this conversion, but not the S7-300. That seems strange to me. It seems funny that Siemens has recently introduced the TON block, something that AB has had for years. It is almost like they are playing catch-up.

Also the online AB/Rockwell support knowledgebase and forums(all free access)are 10x better than this support website for finding information. The Rockwell knowledgebase assigns searchable knowledge base article numbersfor all of the entries andorganizes topics better than Siemens. Siemens does notuses knowledgebase numbers or any numerical indexing that I can tell and many topics listed on a singlesupport webpage (disorganized).

Bottom line: go with AB if you want to keep your projects SIMPLE and disregard the "feature comparison" table at the top of this thread. Having 15+ years experience as a controls engineer, trust me when I say "workability" trumps "features" every time. The K.I.S.S. principle (keep it simple stupid) applies here, and without doubt AB is much simpler and more workable than Siemens when it comes to ladder logic and online support.

garf123

I think it is a shame that someone starts a thread like this on this support website ...

garf123

... so that Siemens employees/distributors users can post their biased opinions

garf123

Just look at the 2011 Control Magazine Readers Awards results polling hundreds of professionals in our industry:

The results still reflect a North American bias. However, each year we see more responses from automation professionals from outside the United States."

garf123

I think the moderater should delete this thread, it serves no constructive purpose.

Er. Sanjay Mistry

Its nice, but what ever the features, COST MATTERS A LOT.......!!!!!
Just compare cost of both, then you will see why people prefers allen-bradley......!!!

In cost of S7 300-400, you cant get onboard Ethernet, DB-8 & DB-9 pin com ports, onboard analog I/Os in cost of Micrologix or Controllogix from AB.

I wite this coz i have already worked in both make's PLC, SCADA, HMI.....