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I have set all the parameters as per manual for Modbus operation at 9600bps 8n1.

I am unable to start the drive I am sending the following frame to start the drive:

Address of Drive 2
Function 5
Coil 6
Data 1

Can someone help me, Danfoss service Engineer has refused to help since I have not purchased the drive from their Official System House...

Your poll should like like this:
02 05 00 06 FF 00 6C 08

Thank you I will try it & post the result

I recommend you write the entire 16 bit control word versus only the start bit. This would satisfy the requirement that other bits (or hard wired digital inputs) be high to start the drive. Here are two examples:

Start drive, Run 40%:
Byte 0: 02 Address
Byte 1: 0F Force multiple coils
Byte 2: 00 Coil address Hi
Byte 3: 00 Coil address Lo
Byte 4: 00 No. of coils Hi
Byte 5: 20 No. of coils Lo
Byte 6: 04 Byte count
Byte 7: 7C Force data Hi
Byte 8: 04 Force data Lo
(047C-hex (reversed) is the control word to start the drive)
Byte 9: 99 Force data Hi
Byte 10: 19 Force data Lo
(1999-hex (reversed) is 40% of full speed, 4000 hex)

Stop drive, ramp to a stop:
Byte 0: 02 Address
Byte 1: 0F Force multiple coils
Byte 2: 00 Coil address Hi
Byte 3: 00 Coil address Lo
Byte 4: 00 No. of coils Hi
Byte 5: 20 No. of coils Lo
Byte 6: 04 Byte count
Byte 7: 3C Force data Hi
Byte 8: 04 Force data Lo
(043C-hex (reversed) is the control word to stop the drive)
Byte 9: 99 Force data Hi
Byte 10: 19 Force data Lo
(1999-hex (reversed) is 40% of full speed, 4000 hex)

Danfoss service and applications departments support all individuals regardless of the sales channel - even used products sold via Ebay. :) Perhaps you contacted an independent distributor who was not interested in supporting a product he did not sell. Please contact Danfoss at 800-432-6367 (North America) or download the instruction manual #MG02A402 at their website.

Bruce Widell
Danfoss Drives
Application engineer

Dear Mr. Bruce,

Thank you very much. I will try these setting once I am back in office tomorrow & posts the results.

I am sure Danfoss does not intend to discourage customers, but the application engineer from Danfoss, India, Bombay seemed to be the only guy knowing modbus interface and was not ready to share the details even over the phone, just because I took it from a reseller friend of mine.

Thank you once again

I , an application engineer from LS Automation & Danfoss Engineer, tried to establish the communication , but could not. When I want to communicate to a LS drive, I need to do the following

MOV 1 D0001 ; Write Enable
MOV 5000 D0002 ;Frequency 50Hz
MOV 2 D0003 ; Move forward

So I basically have to tell in their communication software xg-pd
1) Device No
2) Number bites to send
3) Trigger on which the command is sent
4) Starting address of data in my case d001 for the LS/LG drive
5) Memory Area to store the data 0x4xxxx

So please guide me what do I have to input into such registers for FC51 Danfoss Drives

Urgent help is appreciated

The answer to your questions will take a bit more space than available on this forum. I recommend you visit:

http://www.danfoss.com/BusinessAreas/DrivesSolutions/Doc umentations/Technical+Documentation.htm

Download the drive's instruction manual #MG02A402. Section "5: Modbus RTU" pages 24 through 39 of the manual provides the information you need.

I have no knowledge of the LS Industrial System's XG-PD software product so I can not help there. If you need additional help consider contacting Danfoss at hotline_usdde @ danfoss.com

Bruce Widell
Application engineer
Danfoss Drives
USA

Dear Mr.Bruce

I have already gone through the manual & can't just get it right

Dear Mr.Bruce

Thank you for your help Finally we got it working