Communicate with Omron PLC

[StevenK]

Hi, All LV Experts.

I have 1 project which require using LV 8.2 to communicate with Omron PLC model CJ1M-CPU11, surf around & found out that require using IA OPC server which I don't have & do not plan to invest on it.

So, seek for other advise on how to develop such project without using OPC Server.  The project is to monitor & sending data to PLC memory through RS-232 as what OPC server did.

Hope to get any suggestion....

Thanks in advance.

Steven Koay

[unclebump]

What protocol does the serial port use for data transmission?? There is an NI Modbus library that you can download. Maybe you could buy a card for the plc that supports modbus. Maybe a third party device that converts the Omron protocol to Modbus?? How much data do you need to read and how fast??

Message Edited by unclebump on 05-30-2007 04:27 AM

[Donald]

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StevenK wrote:

Hi, All LV Experts.

I have 1 project which require using LV 8.2 to communicate with Omron PLC model CJ1M-CPU11,

 ... how to develop such project without using OPC Server.  ...

---

You may want to take a look at a download available at MrPLC.com that allows the CJ1M to serve as a modbus slave via the CPU's serial port.  I think it's also available somewhere from Omron.  Haven't used it myself.

<snip>
The Slave Interface allows the use of CS1G/H and CJ1G/H/M to be used like a slave device of MODBUS network. The PLC responds to the commands of a Master MODBUS device connected to the CPU RS232 port of an OMRON CS1/CJ1 PLC.  The Slave Interface responds to commands 03H (reading from data memory) and 10H (writing to data memory).
<snip>

[summit677]

I think you can see this artical:

http://www.smartlabx.com/blog/labview/73-how-to-communication-between-omron-plc-and-labview.html

[summit677]

SmartlabX moved to http://www.thinkdeep.cn/labview/1-how-to-communication-between-omron-plc-and-labview.html

[rpage]

It looks like that article has moved again. Does anyone know where it might be now?

Thanks.