Hi, i'm using Step7 5. 5. How do I force an output of a safety module (4 F-DI/3 F-DO DC24V/2A)? If I change the signal from 0 to 1 in the VAT table it shows that the signal is 1 but the output led is not lit. Can I even force a safety output this way? I thought that maybe not and tried to make a safety program - just some basic "if input is 0 then output is 1" but I can't use the I/Os of the module because they are not "fail-safe" addresses as STEP tells me.

So the main idea is that I need to change the outputs of the safety module to 1 (in easiest way possible).

proov123

Hi, i'm using Step7 5. 5. How do I force an output of a safety module (4 F-DI/3 F-DO DC24V/2A)? If I change the signal from 0 to 1 in the VAT table it shows that the signal is 1 but the output led is not lit. Can I even force a safety output this way? I thought that maybe not and tried to make a safety program - just some basic "if input is 0 then output is 1" but I can't use the I/Os of the module because they are not "fail-safe" addresses as STEP tells me.

So the main idea is that I need to change the outputs of the safety module to 1 (in easiest way possible).

Hello,

Have you already seen this:

 https://support.industry.siemens.com/tf/ww/en/posts/how-to-make-f-outputs-high/105278/?page=0&pageSize=10

Hello 

The Safety PLC does not accept the changes in VAT.

You should make a use Global memory in Normal PLC like M0.0.

and put it at the Out put of your Output in your safety output in your safety Block.

hi,

a simply look in the manual of Distibuted Safety:

SIMATIC Industrial Software S7 Distributed Safety - configuring and programming

Additional rules for Testing

● Forcing is not possible for F-I/O.

● Setting breakpoints in the standard user program will cause the following errors in the

safety program:

– Expiration of F-cycle time monitoring

– Error during communication with the F-I/O

– Error during safety-related CPU-CPU communication

– Internal CPU faults

If you nevertheless want to use breakpoints for testing, you must first deactivate safety

mode. This will result in the following errors:

– Error during communication with the F-I/O

– Error during safety-related CPU-CPU communication

● Changes in the configuration of F-I/O or safety-related CPU-CPU communication can

only be tested after the hardware configuration has been saved and downloaded, and

after the safety program has been compiled and downloaded in the "Safety Program"

dialog.

 To test your program better read chapter 10.9 before. The whole procedure is described there.

hope this helps,

regards,

Similare topic with some leads to help :

https://support.industry.siemens.com/tf/ww/en/posts/how-to-make-f-outputs-high/105278/?page=0&pageSize=10#post846694

Regards

Seb