This is a pre-production deployment of Warehouse, however changes made here WILL affect the production instance of PyPI.
Latest Version Dependencies status unknown Test status unknown Test coverage unknown
Project Description

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.


The library is currently test on Python 2.6, 2.7


The package can be installed from


git clone
cd pycomm
sudo python install


pip install pycomm


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__':
        format="%(levelname)-10s %(asctime)s %(message)s",
    c = ClxDriver()


        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):
        c.write_array("TotalCount", "SINT", w_array)


See the following snippet for communication with a Micrologix PLC:

from pycomm.ab_comm.slc import Driver as SlcDriver
import logging

if __name__ == '__main__':
        format="%(levelname)-10s %(asctime)s %(message)s",
    c = SlcDriver()

        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')


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 in advance for feedback and suggestions


pycomm is distributed under the MIT License

Release History

Release History


This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Show More

Download Files

Download Files

TODO: Brief introduction on what you do with files - including link to relevant help section.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
pycomm-1.0.8.tar.gz (23.1 kB) Copy SHA256 Checksum SHA256 Source Nov 1, 2015

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS HPE HPE Development Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting