adccommunitymod (AutomationDirect) asked a question.
SVA-2040
Created Date: July 11,2008
Created By: pcalonzi
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Hi everyone, I have just purchased a SVA-2040 motion controller and am connecting the unit to an allen bradley micrologix 1200 plc. Does anyone have a wiring diagram and program pointers on making the two components communicate over modbus? This is my first time using modbus. Thank you, -Pat Alonzi Banjo Corporation
Created Date: July 16,2008
Created by: OpZed
The easiest wiring between these two devices would be the following:
A-B 1761-CBL-PM02
DB9 Gender Changer
DB9 Null-Modem Adapter
ADC SVC-PCCFG-CBL
In order for the MicroLogix 1200 to be a Modbus Master you must configure the serial port in the Channel Configuration. Hopefully you have the PLC version which has two serial ports. You’ll need one for programming and monitoring during debugging, and the other to connect with the servo. Chapter 6 of the servo manual shows the required parameters inside of the servo. These may need to be altered to match the PLC serial port setup. After the ports are configured on both devices you’ll need to write PLC code using the MSG instruction.
This FAQ is available from Rockwell which maybe useful: http://rockwellautomation.custhelp.com/cgi-bin/rockwellautomation.cfg/php/enduser/std_adp.php?p_faqid=27158&p_created=1071723600
Appendix E of the MicroLogix reference manual covers Modbus: http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1762-rm001_-en-p.pdf
Created Date: July 17,2008
Created by: pcalonzi
What if I also wanted to add a AB Panelview 300 to the mix?
ps I have a plc with 2 serial ports on it.
Thanks,
-Pat Alonzi
Created Date: July 17,2008
Created by: pcalonzi
Can I expand my modbus network using the 1761-NET-AIC controllers?
-Pat
Created Date: July 17,2008
Created by: OpZed
The PV300 can only be a master device and does not have a Modbus driver available. So you would probably want to use a RS-232 (DF1) version and connect it directly to your second serial port. Of course this makes it harder to develop because you can't be online with all devices at the same time. A-B does make a "Port Splitter " for use with the DF1 protocol. http://literature.rockwellautomation.com/idc/groups/literature/documents/in/1747-in516_-en-p.pdf
But after you start adding on so many extras you might end up better changing to a larger class of PLC which would allow ethernet communications.
Yes you can use the AIC with modbus, see page 2 of the "27158.doc " in the FAQ link.
Created Date: July 17,2008
Created by: pcalonzi
I have the DF1 PV300 so I should be able to use the 1747-DPS1 correct?
thank you,
Pat
Created Date: July 17,2008
Created by: OpZed
Be aware when using a splitter that the serial through put speed will be lower. So it will take longer to download to the PLC and the PV speed maybe reduced, but on a 3 " PV that shouldn't be a major problem.
Looks like the DPS1 should work, but you should probably talk with your A-B supplier about it. The DPS2 has some extra features that could be useful. Don't forget that you'll need more of those expensive A-B cables.
Created Date: July 11,2008
Created by: pcalonzi
Hi everyone,
I have just purchased a SVA-2040 motion controller and am connecting the unit to an allen bradley micrologix 1200 plc. Does anyone have a wiring diagram and program pointers on making the two components communicate over modbus? This is my first time using modbus.
Thank you,
-Pat Alonzi
Banjo Corporation