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Chris Elston

Profibus to Serial

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I want to connect to a Siemens PLC with Profibus DP as a SLAVE, then have a way to send serial strings out through an RS-232 or RS-422 interface. I am working on a super simple application, so I would rather set some FLAG bits in the PLC, and when those FLAG bits are set, have a device send a "serial string" out. I am envisioning a lookup table in this "device" I am looking for, that when a FLAG bit is logical "1" in the PLC, it send the matching "string out" as an output. My question is, have any of you ever used a device like this? Where can I buy one? It's going to be a gateway device of some sort I imagine, but most of the common ones like Anybus or RTA are not made in the way I described. They handle the data as a pass through from serial byte data on the Profibus side through to a hex code on the ASCII serial side. I'd rather have a simple table inside the device, that I can configure the strings and map that string to a bit change of state from the PLC, and Boom Done...

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Hi, With the Anybus Communicator for Profibus (AB7000) you can do just that. You need to configure your various serial strings and asign a trigger byte to each and let the PLC change the trigger byte in order to send the string. You need to contact our office in Chicago, see contcat details below: Sales: +1 312 829 0601 Toll Free: +1 888 826 9287 Email: us-sales@hms-networks.com //Patrick L

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How many "trigger" bytes can I configure in the Anybus? I thought if I recall, I could only setup one. I've used many, many Ethernet/IP to Serial Anybus modules, just not a Profibus one. The way I did the Ethernet/IP one was I send over a string and the module re-transmits the string. So it does not operate on a trigger byte. Attached is a sample of my Ethernet/IP version. The reason I elected this way is because I made custom AOIs in the AB PLC to send to the registers. Which worked out great. In this new application, I don't need to make an elaborate interface, I was hoping to configure "trigger" bits that would send dedicated strings. I was hoping for maybe 10-20 string I could pre-configure in a gateway. Anybus-EDI-192.168.1.13-RS232-9600baud.zip

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Hi, well the gateway supports up to 150 transactions and thus that should be the limitation. You need to asign one trigger byte/output (string), as I have done in the enclosed configuration. Of coarse you would probably want to change the strings.... my config.zip

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Hi, Regarding converting Profibus DP to RS-232, you may use I-7550 module which you can access to Input data area from Profibus (master or Slave) and also Output data area and you can easily configure it by its Utility software. you can find more in its manual: http://www.icpdas-usa.com/i_7550.html You can download the manual from http://www.icpdas-usa.com/documents/i7550%20user%20manual-en.pdf Good Luck!

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