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I have the cpppo Python package installed and I have an ABLogix IO Server with 192.168.1.100 IP that I typically connect to it with different software (not python) as 192.168.1.100,1,0.

My problem is I cannot get it to bring back the value of a tag on an accessible PLC when that tag's data type is set to String in the PLC RSLogix 5000 code. The string value I'm testing with is a 12 character alphanumeric string if that matters so U123HTS76312

My question is to know if someone can see maybe something I'm overlooking that will allow me to get the value from a tag where the PLC has it defined as a String data type?

Note: According to the README.org in the client.connector.get_attribute_single and .get_attributes_all section, it states "To access Get Attribute data with CIP type conversion, use cpppo.server.enip.get_attribute’s proxy classes, instead."

• I think using for message in source.read([(TagName, "SSTRING")], portLink) in the non-working example "c." below is specifying the CIP
  type but it doesn't work

• 
  

  Potential Related Issue: Problem reading/writing STRING data types

  
  
  
  • 
    

    I get this same error if I try to write a value so that's why I think it may be related.

    
    
    

    
    

    python -m cpppo.server.enip.client -a 192.168.1.100 "UL1_LOTCODE_STR_X=(STRING)123HFGR45678"
    
    11-08 10:51:47.692 MainThread enip.cli WARNING validate Client Single Write Tag UL1_LOTCODE_STR_X returned non-zero status: Status 255 [8455]
     UL1_LOTCODE_STR_X <= ['123HFGR45678']: 'Status 255 [8455]'
    

    
    

    
    
  
  

The Context Begins. . .

1. It Works. . .

I have a tag named UL1_TICKETWEIGHT_X which is set as a DINT in the PLC logic that I get the correct sensor data value back from as expected using the below logic.

Working Python Logic

from cpppo.server.enip.get_attribute import proxy_simple, proxy
from datetime import datetime
import time

TagName = "UL1_TICKETWEIGHT_X"
host = "192.168.1.100"
portLink = "route_path = ['link':1,'port':0]"
source = proxy(host)

for message in source.read(TagName, portLink):
 val = message
 timestr = str(datetime.now())
 print([timestr, val])

Output

UL1_TICKETWEIGHT_X == 55000 
['2018-11-07 19:59:24.853017', [55000]]

2. It Doesn't Work. . .

I have a tag named UL1_LOTCODE_STR_X which is set as a String in the PLC logic that does not get back the correct data from the sensor with the various things I've tried below to show a few.

I did many other things and read over slews of the code in the files hoping I could figure out which class or method to use or what arguments to pass to what, and so forth.

I have also set the value of UL1_LOTCODE_STR_X to a DINT type value (it is still String type though at PLC level) such as 15 and it still has the same problem

a. Non-Working Python Logic

from cpppo.server.enip.get_attribute import proxy_simple, proxy
from datetime import datetime
import time

TagName = "UL1_LOTCODE_STR_X"
host = "192.168.1.100"
portLink = "route_path = ['link':1,'port':0]"
source = proxy(host)

for message in source.read(TagName, portLink):
 val = message
 timestr = str(datetime.now())
 print([timestr, val])

Output (error)

Traceback (most recent call last):
 File "DesktopTest.py", line 11, in <module>
 for message in source.read(TagName, portLink):
 File "PythonPython36-32libsite-packagescppposerverenipget_attribute.py", line 431, in read
 for val,(sts,(att,typ,uni)) in reader:
 File "PythonPython36-32libsite-packagescppposerverenipget_attribute.py", line 606, in read_details
 depth=self.depth, multiple=self.multiple, timeout=self.timeout )):
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1393, in operate
 for idx,dsc,req,rpy,sts,val in harvested:
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1258, in pipeline
 col = next( harvester )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1190, in harvest
 issued, self.collect( timeout=timeout )): # must be "lazy" zip!
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1115, in collect
 response,elapsed = await( self, timeout=timeout )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 872, in await
 for response in cli: # if StopIteration raised immediately, defaults to signalling completion
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 546, in __next__
 for mch,sta in engine:
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1226, in delegate
 for which,target in submach: # 75% of runtime is spent inside 'run'
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1226, in delegate
 for which,target in submach: # 75% of runtime is spent inside 'run'
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1291, in delegate
 raise NonTerminal( "%s sub-machine terminated in a non-terminal state" % ( self ))
cpppo.automata.NonTerminal: ( data.( select.((noop)) ) ) sub-machine terminated in a non-terminal state

b. Non-Working Python Logic

from cpppo.server.enip.get_attribute import proxy_simple, proxy
from datetime import datetime
import time

TagName = "UL1_LOTCODE_STR_X"
host = "192.168.1.100"
portLink = "route_path = ['link':1,'port':0]"
source = proxy(host)

for message in source.read_details(TagName, portLink):
 val = message
 timestr = str(datetime.now())
 print([timestr, val])

Output (error)

Traceback (most recent call last):
 File "DesktopTest.py", line 12, in <module>
 for message in source.read_details(TagName, portLink):
TypeError: read_details() takes 2 positional arguments but 3 were given

c. Non-Working Python Logic

from cpppo.server.enip.get_attribute import proxy_simple, proxy
from datetime import datetime
import time

TagName = "UL1_LOTCODE_STR_X"
host = "192.168.1.100"
portLink = "route_path = ['link':1,'port':0]"
source = proxy(host)

for message in source.read([(TagName, "SSTRING")], portLink):
 val = message
 timestr = str(datetime.now())
 print([timestr, val])

Output (error)

UL1_LOTCODE_STR_X == None 
['2018-11-08 00:05:48.424095', None]

d. Non-Working Python Logic

Note: This works if I put a tag in as the argument with is not a String type within the PLC logic.

python -m cpppo.server.enip.client -a 192.168.1.100 "UL1_LOTCODE_STR_X"

Output (error)

Traceback (most recent call last):
 File "PythonPython36-32librunpy.py", line 193, in _run_module_as_main
 "__main__", mod_spec)
 File "PythonPython36-32librunpy.py", line 85, in _run_code
 exec(code, run_globals)
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1649, in <module>
 sys.exit( main() )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1630, in main
 fragment=fragment, printing=printing, timeout=timeout )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1406, in process
 transactions = list( self.results( operations=operations, **kwds ))
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1398, in results
 for idx,dsc,req,rpy,sts,val in self.operate( operations, **kwds ):
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1393, in operate
 for idx,dsc,req,rpy,sts,val in harvested:
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1283, in validate
 for index,descr,request,reply,status,val in harvested:
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1258, in pipeline
 col = next( harvester )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1190, in harvest
 issued, self.collect( timeout=timeout )): # must be "lazy" zip!
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 1115, in collect
 response,elapsed = await( self, timeout=timeout )
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 872, in await
 for response in cli: # if StopIteration raised immediately, defaults to signalling completion
 File "PythonPython36-32libsite-packagescppposerverenipclient.py", line 546, in __next__
 for mch,sta in engine:
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1226, in delegate
 for which,target in submach: # 75% of runtime is spent inside 'run'
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1226, in delegate
 for which,target in submach: # 75% of runtime is spent inside 'run'
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 645, in run
 source=source, machine=machine, path=path, data=data, ending=ending ):
 File "PythonPython36-32libsite-packagescpppoautomata.py", line 1291, in delegate
 raise NonTerminal( "%s sub-machine terminated in a non-terminal state" % ( self ))
cpppo.automata.NonTerminal: ( data.( select.((noop)) ) ) sub-machine terminated in a non-terminal state

Other Specs

• 
  Python: 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)]
  


• 
  OS: Windows 10