Regarding getting error when Historical Alarms and Events fetched through python opcua's read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041)

[rajnishnationfirst]

Hi Colleagues,

I am fetching historical alarms and events over OPCUA Protocol .

Alarms and Events are logged at the SCADA side ( Siemens WinCC SCADA ) and is visible at WinCC Side .

Also i am getting alarms and events in real time from handler's using teh below code suceesfully over OPCUA:

**class SubHandler(object):

def datachange_notification(self, node, val, data): pass #print("Python: New data change event", node, val)

def event_notification(self, event): print("Python: New event", event)**

Below are the points which i need help to fecth alarms and events from historical alarms and events ove r OPCUA:

1. Historical alarms are fetched using node function node.read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) ,

2. Will opcUA node.read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) work on nodes other than alarms nodes ( Means are Alarms nodes are different and data nodes are different ? ) ?

3. node.read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) when called on alarms and events node id's i a getting error as below .

3. When i m calling the node.read_raw_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) on alarms nodes i am getting Historical Data's but not historical alarms and events .

Some questions :

1. Can i use node.read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) on OPCUA server for fetching historical alarms and events ?

2. Or is there is need to configure any other server's like OPC A&E Server separately to fecth historical alarms and events ?

Would be great if anyone from the group can assist me on this.

Thanks and Regards Rajnish Vishwakarma

[AndreasHeine]

does "BadNotImplemented" came from WinCC? look in the wiresharke trace! what is the response on "read_event_history()"

edit:

always use wireshark and no encryption for developement otherwise its hard to guess whats going on...

[rajnishnationfirst]

Thanks for the reply Andreas,

Yes when i used node.read_event_history(starttime=None, endtime=None, numvalues=0, evtypes=2041) on alarms nodes ( TAGS ) and queried WinCC SCADA over OPCUA server , i got the error / exception as "BadNotImplemented" ( Pls check the above snap attahed above in the post.)

Thanks and Regards Rajnish Vishwakarma

[AndreasHeine]

the name is Andreas but i dont mind ;)

( Pls check the above snap attahed above in the post.)

i did! but again if its a response from WinCC OPC UA Server which says "BadNotImplemented" means that the OPC UA Server does not Support what you asked him for!

what WinCC is it there are a lot... tbh!