PROFIsafe Watchdog tolerance

[Booster]

The PROFIsafe Tests include tests with the Safetylayer-Tester.
In documentation of Safetylayer-Tester, the watchdog test is required for certification.
It should be checked whether the measured times are within tolerance.

Maximum value = ((watchdog value + 10%) + device cycle time + inaccuracy of
measurement)

Does the Device-Cycle-Time correspond to the Device-Acknowledgment-Time?
Or does one of these times also include other times such as the transmission time?

[DanielS]

The PROFIsafe Tests include tests with the Safetylayer-Tester.
In documentation of Safetylayer-Tester, the watchdog test is required for certification.
It should be checked whether the measured times are within tolerance.

Maximum value = ((watchdog value + 10%) + device cycle time + inaccuracy of
measurement)

Does the Device-Cycle-Time correspond to the Device-Acknowledgment-Time?
Or does one of these times also include other times such as the transmission time?

Hi Booster,

no these are two different Times. The Device-Cycle-Time is the cycle time the time the device communicates with the F-Host e.g. 1ms. The Device-Acknowledgment-Time is the time the device needs to react on a changed MonitoringNumber (MNR). There is no other time included such as transmission transmission time.

BR
Daniel

[Booster]

The PROFIsafe Tests include tests with the Safetylayer-Tester.
In documentation of Safetylayer-Tester, the watchdog test is required for certification.
It should be checked whether the measured times are within tolerance.

Maximum value = ((watchdog value + 10%) + device cycle time + inaccuracy of
measurement)

Does the Device-Cycle-Time correspond to the Device-Acknowledgment-Time?
Or does one of these times also include other times such as the transmission time?

Hi Booster,

no these are two different Times. The Device-Cycle-Time is the cycle time the time the device communicates with the F-Host e.g. 1ms. The Device-Acknowledgment-Time is the time the device needs to react on a changed MonitoringNumber (MNR). There is no other time included such as transmission transmission time.

BR
Daniel

Hey Daniel,

thank you for your answer!

How are the wd_min and wd_max values measured in detail?
Is the watchdog started and then monitored cyclically to determine whether it has been triggered? (wd_max)
And how is the wd_min value measured?

Thank you very much in advance for your answer!

[DanielS]

The PROFIsafe Tests include tests with the Safetylayer-Tester.
In documentation of Safetylayer-Tester, the watchdog test is required for certification.
It should be checked whether the measured times are within tolerance.

Maximum value = ((watchdog value + 10%) + device cycle time + inaccuracy of
measurement)

Does the Device-Cycle-Time correspond to the Device-Acknowledgment-Time?
Or does one of these times also include other times such as the transmission time?

Hi Booster,

no these are two different Times. The Device-Cycle-Time is the cycle time the time the device communicates with the F-Host e.g. 1ms. The Device-Acknowledgment-Time is the time the device needs to react on a changed MonitoringNumber (MNR). There is no other time included such as transmission transmission time.

BR
Daniel

Hey Daniel,

thank you for your answer!

How are the wd_min and wd_max values measured in detail?
Is the watchdog started and then monitored cyclically to determine whether it has been triggered? (wd_max)
And how is the wd_min value measured?

Thank you very much in advance for your answer!

Hi Booster,

no these are two different Times. The Device-Cycle-Time is the cycle time the time the device communicates with the F-Host e.g. 1ms. The Device-Acknowledgment-Time is the time the device needs to react on a changed MonitoringNumber (MNR). There is no other time included such as transmission transmission time.

BR
Daniel

[DanielS]

Hi Booster,

no these are two different Times. The Device-Cycle-Time is the cycle time the time the device communicates with the F-Host e.g. 1ms. The Device-Acknowledgment-Time is the time the device needs to react on a changed MonitoringNumber (MNR). There is no other time included such as transmission transmission time.

BR
Daniel

Hey Daniel,

thank you for your answer!

How are the wd_min and wd_max values measured in detail?
Is the watchdog started and then monitored cyclically to determine whether it has been triggered? (wd_max)
And how is the wd_min value measured?

Thank you very much in advance for your answer!

Hi Booster,

the layer tester establishes a connection to the device and starts safety data exchange. At a specific point the togglebit is not changed anymore and this results in a F_WD_Timeout. This happens a few times and the tester is calculating the time between stop changing togglebit and the change in the StatusByte from the device when it realizes the Timeout. Now you have a few measurements where you got a min and a max value.

Best regards,
Daniel