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jeanvaljean

Need support: Non-protocol between FX3U (485-bd) and Inverter D700 mitsu

12 posts in this topic

Posted (edited)

Nice day to all

I have a problem when using RS instruction (FNC 80) to programming the connectivity between FX3U -485-BD and D720 mitsubishi

I had setup parameter of inverter and programming the PLC  as attached file.

For the wiring i were follow : One pair wiring as manual

(I tried use other way to connect: inverter link , this way i were success to control this inverter but when using RS instruction still can't)

Please kindly  teach me how to solve this issue due to I'd tried 3 weeks ago but still did't have any change.

Many thanks.

 

 

 

RS-485 communication with D700.rar

Edited by jeanvaljean

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Why do you use a non-protocol instead of predefined inverter protocol???

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Posted (edited)

Because i want try to used various way to connect between plc via 485-bd and inverter.

Edited by jeanvaljean

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Have looked at... All is wrong in your program...

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Posted (edited)

8 hours ago, Inntele said:

Have looked at... All is wrong in your program...

Thanks for your time to check my program...

could you please teach me improve it ( program plc and parameter of inverter)with thanks

Edited by jeanvaljean

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Posted (edited)

You have not read both manuals (to VFD & PLC Comm) carefully.
In particular:
- The Com-port settings will become actual since the next program scan. When its settings is performing, the Com-port must be empty. Thus, the Com-port should be adjusted (re-adjusted) one scan before the RS instruction activation. If you don't use several protocols at the same port, the Com-port settings might be done only once, in the first scan.
- The array of message should be represented either in 16-bit, or in 8-bit mode form, but no as a mix.
- The VFD ParamNum in Modbus message = VFD ParamNum - 40001
- The VFD ParamValue is represened in BCD, not BIN, format.

etc. etc.

All mentioned is written in manuals. So read the manuals with attention again.

Related to the VFD parameters setting yet can not say exactly. Will check it next week.

Edited by Inntele

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Dear Mr. Inntele

thanks for your comment, i’ll try agian.

If have any points not clears , i’ll bother you again.Plaese kindly teach me.

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On 7/8/2019 at 10:01 AM, Inntele said:

You have not read both manuals (to VFD & PLC Comm) carefully.
In particular:
- The Com-port settings will become actual since the next program scan. When its settings is performing, the Com-port must be empty. Thus, the Com-port should be adjusted (re-adjusted) one scan before the RS instruction activation. If you don't use several protocols at the same port, the Com-port settings might be done only once, in the first scan.
- The array of message should be represented either in 16-bit, or in 8-bit mode form, but no as a mix.
- The VFD ParamNum in Modbus message = VFD ParamNum - 40001
- The VFD ParamValue is represened in BCD, not BIN, format.

etc. etc.

All mentioned is written in manuals. So read the manuals with attention again.

Related to the VFD parameters setting yet can not say exactly. Will check it next week.

I had read again about protocol frame, saw that my programming missing CRC code, but when put the CRC into the program ,it still not working

For the VDF parameter, i were follow VDF para No-40001....

 

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Check the length of Snd/Rcv buffers

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On 7/10/2019 at 6:08 PM, Inntele said:

Check the length of Snd/Rcv buffers

Dear mr. Inntele

In the RS instruction ,need i input CRC to the problem.

How to calculating CRC ?please kindly help  me

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FX3U is supplied with instruction for Modbus CRC16 calculation that's named CRC.

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57 minutes ago, Inntele said:

FX3U is supplied with instruction for Modbus CRC16 calculation that's named CRC.

i knew this function , i want to know manual calculate .

Because , i have other plc (fx2n16MT +2n485 bd) .This plc don't have CRC funtion

 

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