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STEP 7 Additional Software

Use of SFC109 in a Safety Program

Thread Starter: Scorpioni   Started: 4/18/2012 9:50 AM   Replies: 2

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  4/18/2012, 9:50 AM
Scorpioni
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Is it possible to have SFC109 functionality (access protection with, for example, a keyed input using SFC109 instead of or in addition to a password) combined with a Safety Program ( 'CPU contains a safety program')?

According to online help, SFC109 only functions with configured protection level 1 without a password, but by disallowing a password no Safety Program can be inserted in the PLC.

Is there an alternative to have an access protection to a safety program that is NOT a password?

The reason for this question is that the client wants their safety program to be well protected and deems a simple password not safe enough. Instead/in addition, they want to install something like a physical lock with a contact to the PLC, so that the programmer needs to input his physical key to disable write protection to the PLC. SFC109 with changing WORD codes tied to an input could solve this problem; however it seems not compatible with a Safety Program.
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  4/18/2012, 11:31 AM
yy1
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Dear Scorpioni,

some time ago I heard about the Euchner-key, but I didn't use it yet.

Hopefully this link helps you a little bit.

http://support.automation.siemens.com/WW/view/en/26481978

Best regards, yy1
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  4/19/2012, 8:30 PM
Aret
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Well, use fingerprint scanner + password:) I'm not joking - saw some good implementation of scanners, that give DO signal on output. As you have PLC you can use one of DIs in combination with password that should be enough.

Of course you can use any alternative solution like token with AES crypto algo, but a bit harder to implement.... 
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