Sign up for a new account in our community. It's easy! This theme may be out of date. Run the support tool in the AdminCP to restore the default theme. Sign in to follow this Followers 0. Has anyone done any communication over Ethernet to modbus devices? The modbus comms to 6 Telemecanique Altivar 31 Drives. So far I have figured out the message instruction addresses the ethernet IP address, and I know the data and structure the drives require.
My question is: how do you format the message instructions destination device? If anyone has experience with this I would greatly appreciate help. Thanx, Tim. Share this post Link to post Share on other sites. Getting Modbus onto TCP is easy. There are at least a dozen on the market. There is no magic to Modbus. On the other hand, Allen Bradley went out of their way to make sure that ALL of the protocols that they support over Ethernet are complicated and not easily translated like Modbus is.
And none of them support Modbus directly. You HAVE to have a protocol translator. There are 3 possible options: 1. Install a Micrologix It has both an Ethernet port and a serial port. You simply connect your Modbus network directly into the Micrologix Read the data into the Micrologix. You can eliminate a component. This is a protocol translator. It has 2 serial ports and one Ethernet port. You can mix and match the 3 ports any way you want. It is a little confusing to set it up but once you've done it, it works very well.
This plugs into the backplane. It is the most expensive option. It is not a translater, it's a mapper. You have to connect to a serial port on it with your PC and manually construct a map for it to use. It works but you can't make online changes. It only supports whatever your map specifies and nothing else. This is the most expensive and least flexible solution. Thanx, for the response Sparky, We do have a Lantronix ethernet to modbus adapter, but I am not sure it is a translator.
It has two serial ports RJ45 and two ethernet ports. It also has screw terminals for the serial port 2. The screw terminal port is the only one that supports RS I have to connect to the Lantronix via a serial port with my laptop to set up the modbus comms, and to set up the IP address of the Lantronix device. If this is a translator, that's great. Latest posts by Shawn Tierney see all. Please enter your comment! Please enter your name here. You have entered an incorrect email address! Indexes April 1, CompactLogix January 22, Since rebranding as The Automation Blog in , we've helped millions of visitors get up to speed on the latest industrial automation technologies, as well as teach them how to use current and legacy automation products.
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