safety Reset OSF

[gabsdav86]

Hi guys!
I know we should use a OSF to the safety reset PB on the PLC logic, but.. wondering, is there any standard ANSI, ISO or any from rockwell for this?

 

[cardosocea]

IEC61511 or &1508 most likely.

 

[Jeev]

An OSF results in a "Manual Reset Function". The short version is that rising edge resets should be avoided, because statistically you are more likely to get a rising edge than a falling edge in a fault condition.

 

[Bit_Bucket_07]

ISO 13849-1 stipulates instruction reset functions must occur on falling edge signals.

From Page 26 of the linked document:
https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1756-rm095_-en-p.pdf