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Description:

pycomm 1.0.8

pycomm is a package that includes a collection of modules used to communicate with PLCs.
At the moment the first module in the package is ab_comm.

Test
The library is currently test on Python 2.6, 2.7

Setup
The package can be installed from
GitHub:
git clone https://github.com/ruscito/pycomm.git
cd pycomm
sudo python setup.py install
PyPi:
pip install pycomm

ab_comm
ab_comm is a module that contains a set of classes used to interface Rockwell PLCs using Ethernet/IP protocol.
The “clx” class can be used to communicate with Compactlogix, Controllogix PLCs
The “slc” can be used to communicate with Micrologix or SLC PLCs
I tried to followCIP specifications volume 1 and 2 as well as Rockwell Automation Publication 1756-PM020-EN-P - November 2012 .
See the following snippet for communication with a Controllogix PLC:
from pycomm.ab_comm.clx import Driver as ClxDriver
import logging

if __name__ == '__main__':
logging.basicConfig(
filename="ClxDriver.log",
format="%(levelname)-10s %(asctime)s %(message)s",
level=logging.DEBUG
)
c = ClxDriver()

if c.open('172.16.2.161'):

print(c.read_tag(['ControlWord']))
print(c.read_tag(['parts', 'ControlWord', 'Counts']))

print(c.write_tag('Counts', -26, 'INT'))
print(c.write_tag(('Counts', 26, 'INT')))
print(c.write_tag([('Counts', 26, 'INT')]))
print(c.write_tag([('Counts', -26, 'INT'), ('ControlWord', -30, 'DINT'), ('parts', 31, 'DINT')]))

# To read an array
r_array = c.read_array("TotalCount", 1750)
for tag in r_array:
print (tag)

# reset tha array to all 0
w_array = []
for i in xrange(1750):
w_array.append(0)
c.write_array("TotalCount", "SINT", w_array)

c.close()
See the following snippet for communication with a Micrologix PLC:
from pycomm.ab_comm.slc import Driver as SlcDriver
import logging

if __name__ == '__main__':
logging.basicConfig(
filename="SlcDriver.log",
format="%(levelname)-10s %(asctime)s %(message)s",
level=logging.DEBUG
)
c = SlcDriver()
if c.open('172.16.2.160'):

print c.read_tag('S:1/5')
print c.read_tag('S:60', 2)

print c.write_tag('N7:0', [-30, 32767, -32767])
print c.write_tag('N7:0', 21)
print c.read_tag('N7:0', 10)

print c.write_tag('F8:0', [3.1, 4.95, -32.89])
print c.write_tag('F8:0', 21)
print c.read_tag('F8:0', 3)

print c.write_tag('B3:100', [23, -1, 4, 9])
print c.write_tag('B3:100', 21)
print c.read_tag('B3:100', 4)

print c.write_tag('T4:3.PRE', 431)
print c.read_tag('T4:3.PRE')
print c.write_tag('C5:0.PRE', 501)
print c.read_tag('C5:0.PRE')
print c.write_tag('T4:3.ACC', 432)
print c.read_tag('T4:3.ACC')
print c.write_tag('C5:0.ACC', 502)
print c.read_tag('C5:0.ACC')

c.write_tag('T4:2.EN', 0)
c.write_tag('T4:2.TT', 0)
c.write_tag('T4:2.DN', 0)
print c.read_tag('T4:2.EN', 1)
print c.read_tag('T4:2.TT', 1)
print c.read_tag('T4:2.DN',)

c.write_tag('C5:0.CU', 1)
c.write_tag('C5:0.CD', 0)
c.write_tag('C5:0.DN', 1)
c.write_tag('C5:0.OV', 0)
c.write_tag('C5:0.UN', 1)
c.write_tag('C5:0.UA', 0)
print c.read_tag('C5:0.CU')
print c.read_tag('C5:0.CD')
print c.read_tag('C5:0.DN')
print c.read_tag('C5:0.OV')
print c.read_tag('C5:0.UN')
print c.read_tag('C5:0.UA')

c.write_tag('B3:100', 1)
print c.read_tag('B3:100')

c.write_tag('B3/3955', 1)
print c.read_tag('B3/3955')

c.write_tag('N7:0/2', 1)
print c.read_tag('N7:0/2')

print c.write_tag('O:0.0/4', 1)
print c.read_tag('O:0.0/4')

c.close()

The Future
This package is under development.
The modules _ab_comm.clx_ and _ab_comm.slc_ are completed at moment but other drivers will be added in the future.

Thanks
Thanks in advance for feedback and suggestions

License
pycomm is distributed under the MIT License