adccommunitymod (AutomationDirect) asked a question.
Created Date: June 03,2011
Created By: scrawford
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I have 6 drives all set up on an RS485 network talking modbus with the Productivity 3000. My problem is I am having a problem getting the drives to respond quickly to my masked digital input commands. For that matter, all of my write functions. With more than one drive being read and written to, I get a lot of time outs and eventually the values will write (after about 10 to 15 seconds.) I 've changed my automatic poll rates all the way up to 300 msec at 20 msec increment offsets. Ive gone as far down as 100msec at 2 msec offset. Both have the same results. The write commands are only writing when there is an inequality of values being read from the drive. (Not writing all the time.) Any suggestions would be helpful. Thanks
Created Date: June 03,2011
Created by: Do-more PE
If you want the drives to respond immediately, don't use automatic polling. Auto polling will buffer up requests to and from the drives and it takes time to work through the buffer.
Created Date: September 08,2011
Created by: scrawford
for this situation, what is recommended? I currently have a sequencer set in 10ms intervals. Any other suggestions to speed up comms?
Created Date: September 08,2011
Created by: Do-more PE
Something similar to this . You can throw in a timer to spread the comms instructions out a bit if needed.
Created Date: June 03,2011
Created by: scrawford
I have 6 drives all set up on an RS485 network talking modbus with the Productivity 3000. My problem is I am having a problem getting the drives to respond quickly to my masked digital input commands. For that matter, all of my write functions. With more than one drive being read and written to, I get a lot of time outs and eventually the values will write (after about 10 to 15 seconds.) I 've changed my automatic poll rates all the way up to 300 msec at 20 msec increment offsets. Ive gone as far down as 100msec at 2 msec offset. Both have the same results. The write commands are only writing when there is an inequality of values being read from the drive. (Not writing all the time.)
Any suggestions would be helpful.
Thanks