Siemens S7 remember please

[stu]

Hi good people
I haven't touched siemens S7 for a long time and would like a refresher please I have a s7-400 Plc running on a machine which has been modified a few times since I last went on the program , and I don't have the up to date program ?

I've highlighted all the blocks and compared and Yes there is differences if I go to say FC5 to see the changes the online is running with the differences how do I add that to the offline program ? Can I Drag and drop or click the update ? Does the update add the online program to the off line ?

Also silly question if I add a extra bit of code in a block to an existing block and press download if asks me this block exists do I want to overwrite- if I say yes will it stop the Plc or will it compile (it's only for adding a output)
I was looking for a save and complie but couldn't find it ?

It's been a while since I have done this
Thanks stu

 

[sigmadelta]

how do I add that to the offline program ? Can I Drag and drop or click the update ? Does the update add the online program to the off line ?

Note: Before you do anything, make sure your offline project is backed up!

What I've done is from Simatic Manager, with the project open, is open the Online view of the project. So you have the offline and online windows open. I dragged and dropped the online block to the offline project (ex: FC5). This keeps the comments intact, unless new networks were inserted before the end of the block... then your comments would be shifted... they stay on the original offline network numbers.

Also silly question if I add a extra bit of code in a block to an existing block and press download if asks me this block exists do I want to overwrite- if I say yes will it stop the Plc or will it compile (it's only for adding a output)
I was looking for a save and complie but couldn't find it ?

You just download. The CPU will not stop, unless you've made a mistake such as addressing a peripheral I/O address that doesn't exist in the I/O configuration, or referencing a DB that doesn't exist in the program, etc.

 

[stu]

What I've done is from Simatic Manager, with the project open, is open the Online view of the project. So you have the offline and online windows open. I dragged and dropped the online block to the offline project (ex: FC5). This keeps the comments intact, unless new networks were inserted before the end of the block... then your comments would be shifted... they stay on the original offline network numbers.

Is this in compare block ?

 

[putiss]

As sigmadelta noted, backup your offline project! Maybe you create backup of online cpu too. It is useful...

If you want to keep your offline project with all comments etc just show offline and online block in compare editor, switch to stl view and check code. Stl view is useful because you can just copy code with ctrl+c and ctrl+v.

 

[sigmadelta]

open the Online view of the project. So you have the offline and online windows open.

In SIMATIC Manager it's View -> Online

 

[cardosocea]

Also silly question if I add a extra bit of code in a block to an existing block and press download if asks me this block exists do I want to overwrite- if I say yes will it stop the Plc or will it compile (it's only for adding a output)
I was looking for a save and complie but couldn't find it ?

As others have said, download will only stop the PLC if it's a big error and none of the fault OB's have been programmed.

However, S7-400's tend to have EEPROM cards on them... so whenever the power gets cycled, it will reload from EEPROM and none of your changes will be loaded. Unfortunately, burning EEPROM does require a CPU stop.

On the other hand, some models of the S7-400 are quite poor on memory and a fair few companies and integrators were ok with leaving behind a RAM card instead of an EEPROM to be able to use a lower specced processor. Have a look on the card to see where you stand.

 

[sigmadelta]

However, S7-400's tend to have EEPROM cards on them... so whenever the power gets cycled, it will reload from EEPROM and none of your changes will be loaded.

Only if the battery(ies) that are installed in the power supply are dead.