Modbus devices control

That would be a lot of com ports on a pc. Can you instead give each of the units an IP address and use modbus over an ethernet or something similar?

You can use a simple PC, given the right programming. I can't point you to the right programming. You may find that standard laboratory packages have some provision for this. You can code your own.

The reason a lot of applications are in VB is that it is easy to learn and work with.

Michael

Herman Family ha scritto:

Thanks for your reply! Could you point me to some software package? I read about LabView, is it good?

On Mon, 29 Oct 2007 12:44:54 +0100, "John.John" proclaimed to the world:

Labview is not really for control of industrial machines. Can you tell us more about the application?

Does it run all the time? Is material loaded into the process or machine? How fast is the process?

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may be that he has modbus-rtu devices ; if he has modbus-over-ethernet then the task is easier, yes.

but there seems to be plenty of modbus implementations around, just look at

yes, mostly depending on programming skills .. or about any sw house can be contracted to do this kind of work, this is no rocket science.

having one more plc in between might help so that the computer doing the vpn would need to interface only one plc that in turn would speak modbus to rest of the controllers or whatever-modbus-speaking-devices there may be. Having a real plc instead of 6-port serial card is expensive tough but it might pay itself back if the programmer doing the pc-plc -link may do it in modbus-over-ethernet and with single plc ; someone will then need to program that gateway-plc to distribute the configuration items to real conrollers .. requires some thinking and coding anyway..

smells like a holy war coming.. :-)

Paul M ha scritto:

The machine is supposed to run for a production cycle and then be switched off for a while. Material is loaded in it, about every few months or so. The process should be a couple of hours.

John.John ha scritto:

I've found this on freshmeat.

cheers!

Hello John, I had a similar issue while communicating with a modbus device. I had posted my issue on one of the sites and i got a link to this site whe re they had this HMI/SCADA which allows you to control and monitor your mod bus devices. The SCADA they provide is an easy and its very intuitive which made it more comfortable to use it to monitor the devices. If you would like to see the site is