PROFINET Forum

Tristan_Brest wrote: ↑22 Sep 2025, 09:27

PS-cE wrote: ↑12 Sep 2025, 17:18

Tristan_Brest wrote: ↑12 Sep 2025, 10:00 Hello PROFINET experts ,

I am working on an architecture on which i need to send an Emergency Stop Signal throught a Black Chanel communication system (trought antenna).

On the machine side, I have a SIEMENS PLC (S71500 family), which activate the power of the machine. On the other side, I have a remote control for the operator, with an emergency stop. My main problem is that I need to be robust to disconnection between machine and REMOTE Control Up to 10s.

It means that if the link between both is broken for less than 10s, my machine have to not be stopped.

I have tried with a PROFISAFE link, but it seems that I am limited to a disconnection time of 1,92s, linked to the PROFINET Protocol. Are you agree with this value ?

Thank you

Tristan

The upper limit on the PROFIsafe watchdog time (F_WD_Time) is 65535 milliseconds (so roughly a little over 1 minute), which is supported by S7-1500 F-PLCs and also many F-Devices.

You might see a lower, limited upper watchdog time on an F-Device if such defined by its vendor and defined in, e.g., the GSD.

Best Regards,
Christian

Hello Christian,

Thank you for your answer ,but I didn't see it, sorry.
I understand in your message that it could be possile for your understanding.
I am just setting up a moke up to test it, but it seems that I am limited to 1,92s with the PROFINET layer. I mean, in the Real Time settings of my PROFISAFE device, I have to configure the IO cycle and the WatchDog time. If i can choose an update time up to 512ms, i can't set a watchdog time more than 1,92s.
I continue to investiguate.

Thank you
Tristan

Tristan_Brest wrote: ↑12 Sep 2025, 10:00 Hello PROFINET experts ,

I am working on an architecture on which i need to send an Emergency Stop Signal throught a Black Chanel communication system (trought antenna).

On the machine side, I have a SIEMENS PLC (S71500 family), which activate the power of the machine. On the other side, I have a remote control for the operator, with an emergency stop. My main problem is that I need to be robust to disconnection between machine and REMOTE Control Up to 10s.

It means that if the link between both is broken for less than 10s, my machine have to not be stopped.

I have tried with a PROFISAFE link, but it seems that I am limited to a disconnection time of 1,92s, linked to the PROFINET Protocol. Are you agree with this value ?

Thank you

Tristan

Tristan_Brest wrote: ↑22 Sep 2025, 09:27

PS-cE wrote: ↑12 Sep 2025, 17:18

Tristan_Brest wrote: ↑12 Sep 2025, 10:00 Hello PROFINET experts ,

I am working on an architecture on which i need to send an Emergency Stop Signal throught a Black Chanel communication system (trought antenna).

On the machine side, I have a SIEMENS PLC (S71500 family), which activate the power of the machine. On the other side, I have a remote control for the operator, with an emergency stop. My main problem is that I need to be robust to disconnection between machine and REMOTE Control Up to 10s.

It means that if the link between both is broken for less than 10s, my machine have to not be stopped.

I have tried with a PROFISAFE link, but it seems that I am limited to a disconnection time of 1,92s, linked to the PROFINET Protocol. Are you agree with this value ?

Thank you

Tristan

The upper limit on the PROFIsafe watchdog time (F_WD_Time) is 65535 milliseconds (so roughly a little over 1 minute), which is supported by S7-1500 F-PLCs and also many F-Devices.

You might see a lower, limited upper watchdog time on an F-Device if such defined by its vendor and defined in, e.g., the GSD.

Best Regards,
Christian

Hello Christian,

Thank you for your answer ,but I didn't see it, sorry.
I understand in your message that it could be possile for your understanding.
I am just setting up a moke up to test it, but it seems that I am limited to 1,92s with the PROFINET layer. I mean, in the Real Time settings of my PROFISAFE device, I have to configure the IO cycle and the WatchDog time. If i can choose an update time up to 512ms, i can't set a watchdog time more than 1,92s.
I continue to investiguate.

Thank you
Tristan

PS-cE wrote: ↑12 Sep 2025, 17:18

Tristan_Brest wrote: ↑12 Sep 2025, 10:00 Hello PROFINET experts ,

I am working on an architecture on which i need to send an Emergency Stop Signal throught a Black Chanel communication system (trought antenna).

On the machine side, I have a SIEMENS PLC (S71500 family), which activate the power of the machine. On the other side, I have a remote control for the operator, with an emergency stop. My main problem is that I need to be robust to disconnection between machine and REMOTE Control Up to 10s.

It means that if the link between both is broken for less than 10s, my machine have to not be stopped.

I have tried with a PROFISAFE link, but it seems that I am limited to a disconnection time of 1,92s, linked to the PROFINET Protocol. Are you agree with this value ?

Thank you

Tristan

The upper limit on the PROFIsafe watchdog time (F_WD_Time) is 65535 milliseconds (so roughly a little over 1 minute), which is supported by S7-1500 F-PLCs and also many F-Devices.

You might see a lower, limited upper watchdog time on an F-Device if such defined by its vendor and defined in, e.g., the GSD.

Best Regards,
Christian

Tristan_Brest wrote: ↑22 Sep 2025, 09:27
[...]

Hello Christian,

Thank you for your answer ,but I didn't see it, sorry.
I understand in your message that it could be possile for your understanding.
I am just setting up a moke up to test it, but it seems that I am limited to 1,92s with the PROFINET layer. I mean, in the Real Time settings of my PROFISAFE device, I have to configure the IO cycle and the WatchDog time. If i can choose an update time up to 512ms, i can't set a watchdog time more than 1,92s.
I continue to investiguate.

Thank you
Tristan

Tristan_Brest wrote: ↑18 Sep 2025, 17:19
[...]

Hello, thank you very much for your answer.

I 'm sorry, but I don't know what is the SFRT
I mean, I just know that if the connection is good between the remote control and the PLC, and that en emergency stop is pushed, i need to stop immediatly.
But, also, I don't have to stop the machine if the communication is broken for less than 10s. During this 10s, if the communication do not come back, I assume that i do not know the emergency stop signal and I don't stop the machine.

Hope this could help you to understand my question.

Thank you
Regards
Tristan