I have been assigned the task of creating a serial communications driver to interface our motion controller product with the Mitsubishi MELSEC line of PLCs. I am having a difficult time finding any specific information on the
protocol that is used. Is the same protocol used to communicate to all series( ie. A, FX, Q, etc ) of MELSEC PLCs or does each series use a
variation of some base protocol?

Can this protocol specification be purchased/download? Is there a developer's toolkit available?

Any help/comments/links would be appreciated...

Tom Matyas
Software Developer
Automation Intelligence
Duluth, GA 30097-4902

 

Mitsubishi have an ActiveX control to deal with comms. I also have some .PDF's on mitsu comms.
Send me your email and I'll post you what I have.

Paul Miller.
([email protected])

 

Mitsubishi has the protocol(s) documented in the hardware manuals for each associated interface module. Contact Mitsubishi and they should be
able to give you the part number of the user manuals.

 

What PLC are you using? Several of the PLC can used protocol or non-protocol. What are you talking to?

I have some info, let me know the plc you are using and I'll try to help.

We use Mitsu to talk to PC's and scanners in the package handling industry.

Anthony

 

Hi Anthony,
Can I ask you a question? How do I send a protocol query over to the PLC. I am not good with bits and hexadecimals as you can see. I don't understand what is the query doing or how does it work.
Currently, I am using a mitsu melsec A PLC and I would certainly be grateful if you can help out. My email is [email protected]

Thanks and Regards,
Xu Weijie

 

I have been assigned the task of creating a serial communications driver to interface our motion controller product with the Mitsubishi MELSEC line of PLCs. I am having a difficult time finding any specific information on the
protocol that is used. Is the same protocol used to communicate to all series( ie. A, FX, Q, etc ) of MELSEC PLCs or does each series use a
variation of some base protocol?

Can this protocol specification be purchased/download? Is there a developer's toolkit available?

Any help/comments/links would be appreciated...

Tom Matyas
Software Developer
Automation Intelligence
Duluth, GA 30097-4902

Did you ever solve this issue?

 

What PLC are you using? Several of the PLC can used protocol or non-protocol. What are you talking to?

I have some info, let me know the plc you are using and I'll try to help.

We use Mitsu to talk to PC's and scanners in the package handling industry.

Anthony

I am investigating ways to get data from a Mitsubishi 4020NX CO2 laser. It does not have a network port. It does not support any DPRNT functions. It uses a MELSEC PLC.

I attached an I/O adapter for START/STOP/READY

You said in an old post, “Mitsubishi has an ActiveX control to deal with comms. I also have some .PDF's on mitsu comms.
Send me your email and I'll post you what I have.”

The objective is to capture part time from the NEST program. I can have a post edit to the GCODE, which would give me a part ID start.

The post would insert lines like this: #MSG SYN_ACK PLC["TEXT99=(Part- widgetA Start)"]

If I was connected to the PLC, either with an add-on Gateway outputting OPC UA or Modbus I could read the tag updates and know when a part is being cut.

Also, is there a way to provide the status of the feed rate override in the same way?