SFC in PCS7 basic questions

AGrS

Also the counter does not work. What do I do wrong if I keep trigger and count_ok on 1 and give count a 1 at the end of my sequence and later make it 0 again?

 It looks like the counter is custom made. You can try to put a OP_TRIG (Classic library) or TRIGGER (APL library) in front of the pulse input. See if it counts then. In SFC you only have to set the input value of the trigger block like Input=1, then that signal is automatically reset, so you don't have to set Input=0 in SFC.

Are you sure the custom block is working?

OK!,

That solves it

Hi Oreca,

Here I am again, just a small question once again.

I made some tweaks in my SFC and then wanted to download it to the CPU. I needed to disable my SFC. https://support.industry.siemens.com/cs/document/14568235/what-should-you-watch-out-for-when-doing-a-delta-download-of-an-sfc-chart?dti=0&lc=en-WW

I could not find how to do it immediatly. I solved it by putting my relevant pumps, motors and valves and SFC into manual mode. Then I was able to download.

But I wander, is there somewhere a quick disable SFC button, that would make life a bit easier.......

edit: If I tried to let the Simatic manager do it automatically during downloading, even if I set it on 700 seconds it still would not succeed

AGrS

Hi Oreca,

Here I am again, just a small question once again.

I made some tweaks in my SFC and then wanted to download it to the CPU. I needed to disable my SFC. https://support.industry.siemens.com/cs/document/14568235/what-should-you-watch-out-for-when-doing-a-delta-download-of-an-sfc-chart?dti=0&lc=en-WW

I could not find how to do it immediatly. I solved it by putting my relevant pumps, motors and valves and SFC into manual mode. Then I was able to download.

But I wander, is there somewhere a quick disable SFC button, that would make life a bit easier.......

edit: If I tried to let the Simatic manager do it automatically during downloading, even if I set it on 700 seconds it still would not succeed

 Hey AGrS,

No problem....

Uhm, yes that means you have made relevant changes to the SFC and it must go to stop.

Normally, you could make sure that the process is stopped, so the SFC could go to IDLE. But that is not always possible. You have to do this on a moment when the plant is not running (or at least the SFC).

When Simatic Manager cannot succeed in reactivating the SFC, something is preventing this. Normally a time of 10sec. is enough to reinitialize the SFC chart.

Please see below for a more detailed view on when you can download change (without SFC reinitializing) and when not:

Notes on downloading changes

●If the sequencer topology has been changed in the SFC charts/SFC types, for example,

steps or transitions have been added, deleted, copied, moved or jump destination has

been changed, and if the modified sequencer is active in the AS, these charts or all

instances of the type must be disabled. Disabling before the download and enabling after

the download is handled by the download program following positive acknowledgment of

a prompt. Otherwise, the download is aborted.

If you perform the download with the SIMATIC Manager function "Compile and Download

Objects", the SFCs are not automatically disabled. In this case, the download will not be

performed and an error message is entered in the log.

●Modifications to the interface of the SFC type are transferred to the SFC instances

immediately. For this reason, the SFC instances must be disabled during the downloads

and execution must be suspended in the CPU. Disabling before the download and

enabling after the download is handled by the download program following positive

acknowledgment of a prompt. Otherwise, the download is aborted.

●For changed SFC charts/types/instances (SFC properties, sequencer properties, object

properties of the step/transitions) whose sequencer topology have not changed, you can

download the changes to the CPU in the RUN after compilation without having to

deactivate the changed SFC.

●If you have not changed the SFC itself, but only the objects that are accessed (for

example, a symbol in the symbol table, runtime groups, block I/O), you do not have to

disable the SFC before downloading changes.

●Following a download of changes, a disabled SFC with the "Autostart: on" property is not

started automatically but must be started again by the operator (MAN) or using the

external view/SFC instance (AUTO).

Hi Oreca,

I can see the current step number as Word variable and also that my SFC is in completing mode. I was wandering how could I display not only the current step number but also the comment that belongs to the step number? Do I need SFC visualisation software per se? I could make message block links to certain step numbers.