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Integrating ROS packages through PLC motor drivers

asked 2016-03-17 08:38:00 -0500

wassimhariri gravatar image

updated 2016-05-22 19:11:16 -0500

130s gravatar image

I have a robot that is already programmed with PLC beckhoff through twinCAT to give commands to the motors to move at a certain speed and direction. I want to control my robot through ROS to do more interesting things like navigation, SLAM ... but i want to keep the PLC as a driver for the motors used and use the same old code to drive the motors with the same logic. Is there a way to integrate between ROS and PLC in such a way for example sending velocity commands (/cmd_vel) and the PLC drives the motors to the desired goal? Thank you in advance

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I am using Beckhoff PLC. How can i interface and program it. I have support for downloading.

Balaji gravatar image Balaji  ( 2016-04-06 06:14:51 -0500 )edit

See my answer above I added link to my driver

sonyccd gravatar image sonyccd  ( 2016-04-06 09:49:00 -0500 )edit

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answered 2016-03-21 07:49:57 -0500

updated 2016-04-06 09:48:33 -0500

Yes amusing you can use modbus. I am doing the same thing myself. I am almost done with a modbus driver for ros that runs over serial and Ethernet. You can simply have ROS read a register and write to one to set the velocity. I am using the Precision 2000 PLC from automation direct and have gotten a refresh rate of 20 registers at around 50Hz over Ethernet. Look out on my github in the next few weeks for me to publish it.

Update: I finished the PLC driver you can download it from here.

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answered 2022-03-15 05:23:27 -0500

Probably the easiest and fastest way to communicate to a Beckhoff PLC is to use ADS libraries (pyads in python or check this repo

In case of any other PLC probably modbus is a good option or any TCP/UDP implementation.

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answered 2016-04-07 02:35:45 -0500

wassimhariri gravatar image

hello, you can read and write from the beckhoff PLC through this amazing package, but first make sure to download the beckhoff TwinCAT Modbus TCP Server‏ and set the port to 502 (usually when you download this tool it is 502 by default). you can download the tool from this link:

i am pretty sure it will work to interface with beckhoff PLC, but i still didnt try it yet, i will try it today and keep you updated.

Good luck

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Asked: 2016-03-17 08:38:00 -0500

Seen: 2,962 times

Last updated: Apr 07 '16