CompactLogix ModbusMaster & Powerflex comm

shrirampendse

Member
Join Date
Dec 2006
Location
Pune, India
Posts
157
Hello ********,

I have gone thru ModbusMaster.acd sample for compactlogix but unable to make headway. I also read its pdf help. I have experience in using modbus on schneider but not on CompactLogix.
I want to use native serial port of L23 to connect Powerflex drive on modbus (No SM2 card or Net AIC DSI adapter). How do I use this sample prj to read freq and write freq to drive?
CompactLogix L23 CPU and powerflex drives (Without any special adapters) to be connected on Modbus . Anyone has done this before?

Help welcome.
 
The CompactLogix is equipped with an RS-232 serial port, while the PowerFlex drives have RS-485 serial ports.

You absolutely must have some kind of electrical converter to convert from RS-232 to RS-485. This can be the 1761-NET-AIC from Allen-Bradley, or virtually any other RS-232 to RS-485 converter on the market. There are dozens of them.

How many drives do you intend to use ? How many systems are you building ?

The 22-XCOMM device would make this extremely easy, but if you are dedicated to using the bare minimum of hardware, the Forum can help.

There have been two editions of the Modbus Master.ACD. Which technote or version are you using ?
 
CompactLogix L23E , RSLogix5000 V17 , Powerflex40 drives (8) on Serial.
I can go for RS23 RS485 adapter, but not 20comm or SM2 or DSI adapters.
Hardware was in some others scope. I have to deal with what is available in panel(Cost main factor so other options not available).
So now I need to Connect L23 to these drives to read status and current and write speed cmd. Star stop is thru Hardwiring.
regards,
shrirampendse
 
Great ! Start looking for a local vendor for the RS-232 to RS-485 converter. I recommend ones that include both signal isolation between the RS-232 and RS485 sides, and a separate RS-485 signal common, which you're going to tie to the ground pin on the PowerFlex drives.

Download the ModSim32 simulator from WinTech software and you will be able to emulate the Modbus devices over an ordinary RS-232 serial link before you have to actually hook up to the drives.
 
CompactLogix Modbus

I previously hooked 16 drives on Modbus RTU to another PLC. With other controllers I routinely use Modbus. So no problem on drives front.
But I am stuck with CompactLogix L23E Serial port Modbus issue.
How do I Read/write These Modbus drives slaves in my L23E on Serial Modbus? Local AB help and ModbusMaster.acd is of not help.

Well let us see what solution I get thru plcs.net???
 
Powerflex connected to PVPLus

On second thought , can these powerflex drives be connected to PVPLUS?
I just saw PVplus manual, thru KepServer Enterprise serial Modbus is available.
 
Last edited:
Well,
Finally I could make it. As of now I could make my CompactLogix ModbusMaster on DF1 port and read/write registers from various nodes of Modbus RTU. Now next task is to hook 8 powerflex drives .
 
Hello...
shrirampendse.

as you posted that you succeeded communicating L23E using modbusmaster.acd.
will you please help me out with this.
I need to communicate energy meters (Conzerve EM6400).
 
Hi Amit,
I can send you the acd file . But remember it is a specialists job. First communicate energymeter to your laptop on Modscan or any other modbus master sw. If you can successfully do this , further you can go ahead with CLX. Send ur mail id to [email protected]
 

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