I need clarification on a few points in Siemens S7 regarding downloading and uploading to the PLC. More
specificially a ET200S IM151-7 CPU with a memory card (MC).
I don't have the hardware with me in the office, I need to do some minor modifications to this PLC at a clients site. Obviously, I want to backup the existing program and then download my modiciations. Yes, I do have a copy of the S7 project - but I am not sure if it is the latest code (hence the need to backup what is actually running on the PLC).
Ok, with regards to downloading, I can't figure out the specific difference of all the options under Simatic
Manager -> PLC menu:
1) Download
2) Compile and Download
3) Copy RAM to ROM
4) Download User Program to Memory Card
5) Save to Memory Card
So far, I been selecting 'Blocks' and clicking the 'Download' option. Then I would go to HWConfig program and then doing another 'Download'.
I am curious to know what all these other download options are.
Should I be using the 'Compile and Download' instead? Or maybe the 'Download User Program to Memory Card'?
A colleague of mine says that the 'Download' option ONLY downloads to the RAM of the PLC. If this is true (for
the ET200S IM151-7), then that raises a couple of concerns / question:
- Could the PLC potentially have 2 different programs - 1 which is running in RAM (Program A) and 1 stored in
the MC (Program B)?
- If the above point is true, what happens upon a power cycle? Do you lose Program A and end up with Program B
running?
- Does 'Copy RAM to ROM' copy the program running in RAM to the memory card? If so, does this operation also copy the HWConfig?
- Is the HWConfig also known as the 'System data' (in the 'Blocks' list)?
And lastly, what is 'Save to Memory Card' about? Is this for downloading pdf manuals etc?
Ok, that is a bunch of download questions. No doubt, some of the options have overlapping functions and some of them are only applicable to certain PLC models.
I also have a question regarding uploading / backing up the PLC program - specifically backing up a ET200S which has a MC. There seems to be the following options available:
In Simatic Manager
1) Upload to PG / Upload Station to PG
2) Retrieve from Memory card
Using the Siemens 'MMC Card Read Write' program.
I got a bunch of questions related to these options too:
- Does the 'Upload to PG' option upload from RAM or MC, or is there no difference? Are comments uploaded as well? I would say probably not, so should I upload to an existing project or a new project?
- Retrieve from Memory card, is this an option to retreive all the files on the MC?
- What is the difference between using 'MMC Card Read Write' program compared to using 'Save to' & 'Retrieve from' option in Simatic manager?
I understand the 'MMC Card Read Write' only reads and write '.S7img' image files. Is this purely a backup & deploring tool?
Any help on the above questions would be helpful.
specificially a ET200S IM151-7 CPU with a memory card (MC).
I don't have the hardware with me in the office, I need to do some minor modifications to this PLC at a clients site. Obviously, I want to backup the existing program and then download my modiciations. Yes, I do have a copy of the S7 project - but I am not sure if it is the latest code (hence the need to backup what is actually running on the PLC).
Ok, with regards to downloading, I can't figure out the specific difference of all the options under Simatic
Manager -> PLC menu:
1) Download
2) Compile and Download
3) Copy RAM to ROM
4) Download User Program to Memory Card
5) Save to Memory Card
So far, I been selecting 'Blocks' and clicking the 'Download' option. Then I would go to HWConfig program and then doing another 'Download'.
I am curious to know what all these other download options are.
Should I be using the 'Compile and Download' instead? Or maybe the 'Download User Program to Memory Card'?
A colleague of mine says that the 'Download' option ONLY downloads to the RAM of the PLC. If this is true (for
the ET200S IM151-7), then that raises a couple of concerns / question:
- Could the PLC potentially have 2 different programs - 1 which is running in RAM (Program A) and 1 stored in
the MC (Program B)?
- If the above point is true, what happens upon a power cycle? Do you lose Program A and end up with Program B
running?
- Does 'Copy RAM to ROM' copy the program running in RAM to the memory card? If so, does this operation also copy the HWConfig?
- Is the HWConfig also known as the 'System data' (in the 'Blocks' list)?
And lastly, what is 'Save to Memory Card' about? Is this for downloading pdf manuals etc?
Ok, that is a bunch of download questions. No doubt, some of the options have overlapping functions and some of them are only applicable to certain PLC models.
I also have a question regarding uploading / backing up the PLC program - specifically backing up a ET200S which has a MC. There seems to be the following options available:
In Simatic Manager
1) Upload to PG / Upload Station to PG
2) Retrieve from Memory card
Using the Siemens 'MMC Card Read Write' program.
I got a bunch of questions related to these options too:
- Does the 'Upload to PG' option upload from RAM or MC, or is there no difference? Are comments uploaded as well? I would say probably not, so should I upload to an existing project or a new project?
- Retrieve from Memory card, is this an option to retreive all the files on the MC?
- What is the difference between using 'MMC Card Read Write' program compared to using 'Save to' & 'Retrieve from' option in Simatic manager?
I understand the 'MMC Card Read Write' only reads and write '.S7img' image files. Is this purely a backup & deploring tool?
Any help on the above questions would be helpful.