adccommunitymod (AutomationDirect) asked a question.
DL-06 to EZTOUCH communication slow ..
Created Date: November 14,2004
Created By: JimR
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I set up a network with a 6 " EZTOUCH panel and 2 DL-06 PLCs communicating via. RS485 MODBUS. If I push a button on the panel it sometimes takes up to 5 seconds for the PLC to respond. Any idea why it would be so slow? I'm using 38.4K Baud and the PLC switches are in the TERM position. Is this slow speed normal? JIm
Created Date: November 14,2004
Created by: JimR
I set up a network with a 6 " EZTOUCH panel and 2 DL-06 PLCs communicating via. RS485 MODBUS. If I push a button on the panel it sometimes takes up to 5 seconds for the PLC to respond. Any idea why it would be so slow? I'm using 38.4K Baud and the PLC switches are in the TERM position. Is this slow speed normal?
JIm
Created Date: November 15,2004
Created by: Tech Guy
It sounds like you are experiencing a timeout issue, or possibly you are just throwing lots of dtaa back and forth.
This could be caused by not using wire rated for RS-485 (we recommend Belden 9841), or possibly noise on the line (you did ground the shield at one end only, right?), or not having termination resistors.
About the only way to know for sure if it is noise is to put either an oscilloscope on it or use a communications analyzer.