No

give reasons why not

It would be like trying to download an AB processor using Mitsi GX Developer...Incompatible

Al

but i can use neither of the two versions to program and down load (hardware) to plc S400. so what i want to read is the program on the hardware.

So if the program on the hardwar is Step 7 then you require Step 7 software to read it.

Al

Dear Gilbert Sampa, I assume you have Step7 ver 5.4 on your laptop and your PLC's were programmed using Step 7 ver 4.

I think (I could be wrong!!) Bolton Alan misread this to mean that you had Step 5 and you were trying to read a Step 7 program - if this is the case then Bolton Alan is 100% correct. You can convert from Step 5 to Step 7 so you are not completely without a solution (althought this conversions depends somewhat on how the program was written in the first place)

However if you have step 7 ver 5.4 then you should be able to load the Step 7 ver 4.0 program and work from there. You probably could not load the ver 5.4 program using Step 7 ver 4.0.

Best way to find out is to try and load it.

Hope this helps

Kind Regards

Mr. W.A. Snow

thank you you are right it dosent matter which version you have on your pc as long as its STEP7 you are able to down load from the hardware. its just that i wanted to make sure before i buy version 5.4 its expensive $4300.00

Dear Gilbert Sampa,

Ok, I understood that you had version 5.4 on your PC, sorry about that. To be absolutely sure I would ask the Siemens rep before purchasing but I would be shocked if it was not backward compatible.

Kind Regards

Mr. W.A. Snow

Yes you can upload the program from the plc to your laptop using step7 v5.4 - your laptop version is later than whats in the plc so all is ok

thank you are correct