[?]: How to unprotect protected SFC

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[?]: How to unprotect protected SFC

Post by vonkee » Wed Feb 14, 2007 4:55 am

When I open a project in Step 7, I see SFC52/58/59 and they are protected.
Is there a way to unprotect them to see the program inside?

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Post by CoMod » Wed Feb 14, 2007 5:20 am


but internal PLC SFC is not possible unprotect, because it inside BIOS of PLC.

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Post by adc.automation » Fri Feb 16, 2007 11:38 pm

is not possible open a protected SFC / SFB systems blocks
with Canopener only can unprotect OB / FB or FC user protcted blocks
sorry my english is very bad.

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Post by amarillo » Sat Feb 17, 2007 4:44 am

Hi there,
SFCs and SFBs are part of the PLC firmware.
What you see in STEP7 is only a "fake" empty (and protected :roll: ) block interface to help you call these SFx in your PLC program.
I can't imagine anybody (other then me) being interested in the real code behind those SFx.
If there are any then drop me a line and we can roll the iceberg upside-down 8)

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Post by hanyutian » Wed Mar 07, 2007 6:12 am

I'm interest it too, I find some SFC/SFB can cracked,another can't, It's empty , no code in it

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Special SFC/SFB

Post by camelkrak » Thu May 14, 2009 10:13 am

There is another "trick" with SFC/SFB blocks

I found topic at siemens official site:
http://support.automation.siemens.com/W ... viewreg=WW

inside FC630 is SPECIAL SFC!!!!!!!!!!!!!!!!!!
it is SFC65025 (sic!)

In spite of the fact that inside of FC630 - this SFC i RED (sic!)
it works!
So that means that there is a lot of undocumented
SFC/SFC. Now I'am looking for documentation and cracked
version of Step7 Editor which allows me work with this SFC/SFB

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