CP1L Modbus RTU-Easy Master

[nguyenthanhcanh 3]

Hi all, I use CP1L-20 + CP1W-CIF11 to communication with E5CN (modbus) Port 1: Serial gateway, standard (9600,1,7,2,e) --> corrected (9600,1,8,1,n) (parity as n/o/e same as E5CN side) D32200= #0001 (Slave address) D32201= #0003 (Function: Read) D32202= #0004 (Bytes of Comm. Data) D32203= #0000 (Read PV) D32204= #0001 (1 register) --> corrected #0002 A641.00=ON The result is nothing happenning: COMM LED not flash, A641.00 always ON, nothing in result area Please help me. (Note: I tested in Compoway/F mode using FB --> OK) Edited 18 Sep 2007 by nguyenthanhcanh

[Jay Anthony 118]

Please look closely at the length setup for the commands. Easy_Modbus_Master.pdf

[nguyenthanhcanh 3]

Thank Jay for the help. I checked again and surprised that I must use port 2 (while only one port on CP1L-L20DR-A). See attached picture. I think Omron has some mistakes for memory mapping. PV: 1A = 26 oC Edited 18 Sep 2007 by nguyenthanhcanh

[Nibroc 4]

Thanks Jay, I am going to commission my first 'Modbus Easy Master' on a CP1H next week - the document you posted may save me some time! Nibroc Edited 18 Sep 2007 by Nibroc

[LD_M 2]

On 9/17/2007 at 4:42 PM, Jay Anthony said:

Please look closely at the length setup for the commands. Easy_Modbus_Master.pdf

Hi Jay,

Could you please post again the Easy_Modbus_Master pdf?, I am unable to download the file on the current link, as the link might be already broken.

Thank you.

 

 

[IO_Rack 181]

I'm not sure if this is the same document but this is in our downloads section:

http://forums.mrplc.com/index.php?/files/file/867-easy-to-use-modbus-rtu-master-for-cp1l-cp1h-cj1-cj2-cs1/

[LD_M 2]

Hi IO_Rack,

Thanks for the link,  I'm studying the MODBUS, specifically on the CP1L plc unit.  

I have downloaded files and manuals pertaining to the modbus, using cp1e, cp1L and CJ's....but still could not wrap my head around the topic.....  on the DM and register addressing.

Cheers.