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- #DATA HIGHWAY PLUS CONVERTER SERIAL#
- #DATA HIGHWAY PLUS CONVERTER SOFTWARE#
- #DATA HIGHWAY PLUS CONVERTER PC#
Note that there's no way to use Ethernet/IP directly via protocol conversion especially to route onto DH+ since Ethernet/IP doesn't have an easy way to do multiple gateway routing. You lose all the Ethernet/IP features but my impression is that you were trying to get back to DH+ and not migrating everything early via some sort of interface onto Ethernet. You'll then have a ControlLogix that is speaking DH+ as a DH+ node.
#DATA HIGHWAY PLUS CONVERTER SERIAL#
Or alternatively connect it to the serial port of your ControlLogix and use DF-1 protocol. Or else use the KF2 box as-is but realize that it's a single-PC solution at a time no matter what you do.
#DATA HIGHWAY PLUS CONVERTER PC#
Or alternatively plug the serial port into a single PC and use RS-Linx Gateway. Then use a Digi One IAP to make it a multiple-connection aware setup. Put a PCMK card in it so that it acts as a gateway server for everything or some things.
#DATA HIGHWAY PLUS CONVERTER SOFTWARE#
Load the PC with nothing but the minimum software and this. RS-Linx OEM can support OPC communication for local-only OPC aware HMI's.
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I believe I tracked down at least one or two others when facing the same sort of problem. Use the above device or one of the competitors. Roughly <$5K if you do nothing else with it, but it doesn't stop you from using the backplane for a regular ControlLogix that just happens to be a gateway, too. Use a ControlLogix and route across the backbone.
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The basic problem is that DH+ absolutely, positively has poor support overall. At the HMI/PC level, you could use either network since Ethernet/IP works fine over Ethernet. I ran for about a year over the existing DH+ network with block transfers on all the PLC-5's sending the data to a single "aggregator" PLC which was accessed via Ethernet. At the PLC level, you can always do block transfers. If you’d like to influence how the thing works, hit the contact button from any one of our product pages and let me know what you think.About $1200-$1500 if I recall correctly. We have plans to create a DH+ Device Converter. Those are also proprietary messages that PLCs use to access the data tables of other PLCs. That’s another old protocol, PCCC (Programmable Controller Control and Command Language). New nodes join the network when current nodes find them during periodic searches for additional successors. This protocol is referred to as a link layer protocol as it manages and maintains the network link. Failing that it has to find another successor node. If the successor disappears it passes the token to its successor’s successor. After sending the message it passes the token to its successor. When it has the token it can send one or more messages to other devices on the network. It receives a message that indicates that it has the token. In this protocol, every device knows its successor, its successor’s successor and its predecessor. MEDIA ACCESS – DH+ uses a proprietary token passing protocol. In this case baseband simply means that all devices on the media are using a single frequency. MEDIA – DH+ used Baseband Shielded Twin Axle Cable. That means that there is a main cable and at points along this trunk there is a small drop line that attaches a device to the DH+ network. TOPOLOGY – DH+ uses trunk lines with drops. The Baud Rate is 57.6 kilobaud with Half Duplex transmission (when one node transmits, all other nodes go into receive mode) Signal Level for these differential signals is typically 8-12 volts peak to peak. Because the data is encoded differentially, noise that is common to both wires is ignored. Two wires are used to carry data and that data is represented by voltage differences between the two wires known as differential signaling.
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So, let’s dive into what exactly DH+ is.ĮLECTRICAL INTERFACE – DH+ uses Transformer Coupled Differential Signals meaning that stations do not have to be at the same ground potential (That’s a really good thing). If you do any kind of integration it’s likely that you will need to either get into a DH+ network or replace parts of one. It’s still around in lots of factories around the world. There was a lot of this stuff deployed in the 80s and 90s. I think it was the first network ever used by an Allen-Bradley Programmable Controller and maybe any Programmable Controller. It was designed and built by Allen-Bradley in the late 70s. Data highway is pretty ancient technology.
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