Accessing Historical Data Access ( HDA ) from SIEMENS SCADA using Free OPCUA .

[rajnishnationfirst]

Hi Everyone ,

I want to read the HISTORICAL DATA ( HDA ) from WinCC Siemens SCADA.

I came to know that we have to use the below code :

    **myparams = ua.HistoryReadParams()
    #myparams.x = ???
    #myparams.someotherattr = ???
    myhistory = client.history_read(myparams)**

Final Code :

import sys
sys.path.insert(0, "..")

import logging
import time

from ast import literal_eval as make_tuple

try:
    from IPython import embed
except ImportError:
    import code

    def embed():
        vars = globals()
        vars.update(locals())
        shell = code.InteractiveConsole(vars)
        shell.interact()

from opcua import Client
from opcua import ua
from opcua import uaprotocol_auto

import requests

class Siemens_HDA_Client(object):

    def __init__(self):
        print('Before Connection')
        client = Client("opc.tcp://EC2AMAZ-VJQV23P:4862")
        print('After Execution')

    def get_HDA_Data_From_Siemens_Scada(self):
        myparams = ua.HistoryReadParams()
        #myparams.x = ???
        #myparams.someotherattr = ???
        myhistory = client.history_read(myparams)

p1 = Siemens_HDA_Client()

print('Data')    

print(p1.get_HDA_Data_From_Siemens_Scada())

If anyone can help me out on this . I am not able to locate the module.

Thanks and Regards Rajnish Vishwakarma

[AndreasHeine]

https://github.com/FreeOpcUa/python-opcua/blob/f761ccf0882daff8f000885e851db66b3c0ea167/opcua/ua/uaprotocol_auto.py#L8322

from opcua.ua import uaprotocol_auto

You should use a propper IDE like PyCharm or VS Code! Idle is not really useful for debugging...

[rajnishnationfirst]

Hi Andreas ,

I came to know that history_read is a function which are in UA_client and Node modules , i am using the clientof histtory_read() , i m getting the error mentioned below :

I changed my code to :

import sys
sys.path.insert(0, "..")

import logging
import time

from ast import literal_eval as make_tuple

try:
    from IPython import embed
except ImportError:
    import code

    def embed():
        vars = globals()
        vars.update(locals())
        shell = code.InteractiveConsole(vars)
        shell.interact()

from opcua import Client
from opcua import ua

import requests

class Siemens_HDA_Client(object):

    def __init__(self):
        print('Constructor Called')

    def get_WinCC_Siemens_HDA_Client_Connection(self):
        client = Client("opc.tcp://EC2AMAZ-VJQV23P:4862")
        return client

    def get_HDA_Data_From_Siemens_Scada(self):
        myparams = ua.HistoryReadParameters()
        print(myparams)
        #myparams.x = ???
        #myparams.someotherattr = ???

        hda_client=self.get_WinCC_Siemens_HDA_Client_Connection()
        try:
            hda_client.connect()
            node=hda_client.get_node("ns=2;i=53")
            print('Rajnish')
        finally:
            print("Finally Block")

        myhistory = hda_client.history_read(myparams)

p1 = Siemens_HDA_Client()

print('Data')

p1.get_HDA_Data_From_Siemens_Scada()

Now i am getting the below error ::

AttributeError: 'Client' object has no attribute 'history_read'

[brubbel]

https://github.com/FreeOpcUa/python-opcua/blob/34d98f992f9f7e494be20f028cdf9a05b3b62540/opcua/common/node.py#L492-L498

Use read_raw_history from the node object. This will construct the history parameters for you:

node = hda_client.get_node(...)
dvList = node.read_raw_history(numvalues=10)
print([dv.Value.Value for dv in dvList])

Examples here: https://github.com/FreeOpcUa/python-opcua/blob/master/tests/tests_history.py

[duduyoyo]

Check here, it works with classic OPC HDA/DA/AE. Cheers!