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Gayatri
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India - Member - Electrical Engr

Join Date: Mar 2010
Posts: 4

Communication Between AVR and PLC

06/14/2010 4:25 AM

We have a Basler Electric (USA) make AVR and Metso Automation make PLC system MAX DNA. The PLC system is ethernet based.

We are now trying to establish communication between these devices using the modbus protocol. But there is some error somewhere and we are unable to succeed.

I 'am fairly sure that the required programming and wiring is alright.

Does anybody have any previous experience with these devices. Are there any minor points I might have overlooked?
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Anonymous Poster
#1

Re: Communication between AVR and PLC

06/14/2010 6:26 AM

It is not clear from your description that , the Basler AVR is capable to communicate the modbus protocol. Please check the Basler website. what is the model no. of the AVR?
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Gayatri
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India - Member - Electrical Engr

Join Date: Mar 2010
Posts: 4
#2
In reply to #1

Re: Communication between AVR and PLC

06/14/2010 6:34 AM

The instruction manual of the AVR does give some information on configuring the communication through RS 485 port. But it is inadequate.Hence there is no doubt about the devices' ability to communicate.

The model no. is DECS-300.
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Anonymous Poster
#3
In reply to #2

Re: Communication between AVR and PLC

06/14/2010 7:09 AM

Yes,DECS-300 is with modbus compatibility.Use maxLINK for connectivity between non-Metso products and Metso PLC.
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Gayatri
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India - Member - Electrical Engr

Join Date: Mar 2010
Posts: 4
#4
In reply to #3

Re: Communication between AVR and PLC

06/14/2010 7:16 AM

We have used Maxlinks to create five notepad files- Stationlink, DeviceLink, ComportLink, Points , MOXA links.

The MOXA switch indicator leds for TX blink and those for RX do not blink.

The name of the data types-float, int etc are different in Maxlinks manual and in DECS-300 manual.For eg. Floating Point format is referred to as Float in maxlinks and as RS23_32 in DECS manual. Do you think this could be a problem?

However, all dat types used in the DeviceLinks file have been described in the Base file.
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RDGRNR
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Engineering Fields - Instrumentation Engineering - New Member

Join Date: Dec 2009
Location: San Antonio, TX USA
Posts: 844
Good Answers: 29
#5

Re: Communication between AVR and PLC

06/14/2010 8:20 AM

I'd start with the serial communication. Make sure your baud rates and UART settings are the same on both ends.

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#6

Re: Communication between AVR and PLC

06/14/2010 12:44 PM

The Metso DNA system is not a PLC, it is a software platform SCADA system from what I can see. I don't see where it supports Modbus, although I find that difficult to believe.

"The metsoDNA CR includes ACN I/O fieldbus, PROFIBUS DP/PA, AS -Interface bus and Foundation Fieldbus HSE/H1 solutions."

Are you sure you have a Modbus Master in here somewhere? It's entirely possible that you have two Modbus slave / RTU devices, and if neither is acting as a Master, you get nothing...

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Gayatri
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India - Member - Electrical Engr

Join Date: Mar 2010
Posts: 4
#7
In reply to #6

Re: Communication between AVR and PLC

06/14/2010 10:53 PM

It does support communication over Modbus because we have already established communication between this system and our Micom Relays and UPSs. There is a module called Maxlinks which is used to configure communication. Here, we choose an option to use the Modbus helper.

About Baud rate, yes.. We have checked these settings. Can you please explain what "UART" means??
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Joisey
Active Contributor

Join Date: Mar 2010
Posts: 11
#8
In reply to #7

Re: Communication between AVR and PLC

06/15/2010 8:59 AM

Universal Asynchronous Receiver Transmitter (the chip that does the comms)

In my experience Modbus cable requires special jumpers
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Anonymous Poster (2); Gayatri (3); Joisey (1); JRaef (1); RDGRNR (1)

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