adccommunitymod (AutomationDirect) asked a question.
Created Date: June 14,2013
Created By: Kip
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Is there any way to have multiple panels control a single PLC? I am looking at building an assembly cell that has two stations controlled by a single PLC. I have configured 8 " panels with DL06 and DL205 cells but have never tried multiple (serial coms were used on these cells). One station will have a lot of I/O and one will only have a few points that I need to control. It is my understanding that the CMore is the master and it is not possible, I just wanted to verify this. Can I run multiple panels thru a hub or is it possible to have one serial and one ethernet? Option B is to locate a DL05 next to DoMore and use it as an interface. I only need to control 18 outputs on the smaller station. Any ideas on the best way to get this doen would be appreciated. Thanks in advance.
Created Date: June 14,2013
Created by: Steve Bailey
If you 're staying with serial communications you will need a separate serial port on the PLC for each C-More. If you use Ethernet you can run the cable from the ECOM module to a switch and then connect each C-More to the switch. You could also connect one C-More via Ethernet and the other via serial. Be sure to consider whether you will need to be able to connect your programming computer to the PLC simultaneously with both C-Mores.
Created Date: June 14,2013
Created by: bcarlton
Using Ethernet it is fairly easy to have two CMores attached to a single PLC. If they are addressing entirely different areas of memory then all is ok. If they address the same area then problems may occur. What if two people were changing the same memory location at the same time? One will win. Think of the consequences.
Created Date: June 15,2013
Created by: franji1
Yes, reading from a PLC with multiple C-more's is fine. Writing to a PLC from multiple C-more's can be big trouble, as Bernie stated. It's not that it can't be done technically, but...
Created Date: June 15,2013
Created by: Kip
Thanks for the info. It sounds like what I want to do will work. I will use a Do More H2-DM1E and use Ethernet port on it thru a hub to two EA7-T8C C-mores. One will have "manual control " of station 1 I/O and the other will have "manual control " of station 2 I/O.
As long as the two C-mores do not address the same control bits I will be safe. Each station will have its own I/O and counters.
I was planning on running a sub routine for each station to help me keep them separated as I program essentially having two separate cells. I was going to have the main program call each subroutine each scan.
Please verify that the Ethernet port on the H2-DM1E will work and I do not need an ECOM module.
I will also be using an ERM and Terminator I/O. I saw on the about PLC website it says to use H2-ERM. I was planning on using H2-ERM100 and T1H-EBC100. Is this compatible with Do-More? My assumption is that there is no disadvantage to the 100Mbps modules.
Please let me know if you see any issues with my plan.
Created Date: June 15,2013
Created by: kewakl
Can I run multiple panels thru a hub or is it possible to have one serial and one ethernet?
One CMore connected via serial port. Then through the ethernet port of the SAME CMore, you can use a PASS-THRU Connection to other CMore panels.
See CMore help topic CM010.
I 've never done this, but it is an option.
Created Date: June 15,2013
Created by: Do-more PE
While pass through is an option, it is always better to use Ethernet or serial to each panel and PLC independently if at all possible.
Pass through is basically meant for; "There isn't any other way to do this. "
Created Date: June 16,2013
Created by: kewakl
While pass through is an option, it is always better to use Ethernet or serial to each panel and PLC independently if at all possible.
Pass through is basically meant for; "There isn't any other way to do this. "
True! I was offering this based on the context of the original post.
have configured 8 " panels with DL06 and DL205 cells but have never tried multiple (serial coms were used on these cells).
Created Date: June 17,2013
Created by: GKiser
...Please verify that the Ethernet port on the H2-DM1E will work and I do not need an ECOM module.
This will work just fine (actually faster than having an ECOM).
...I will also be using an ERM and Terminator I/O. I saw on the about PLC website it says to use H2-ERM. I was planning on using H2-ERM100 and T1H-EBC100. Is this compatible with Do-More? My assumption is that there is no disadvantage to the 100Mbps modules.
H2-ERM100 will work fine.
Created Date: June 14,2013
Created by: Kip
Is there any way to have multiple panels control a single PLC? I am looking at building an assembly cell that has two stations controlled by a single PLC. I have configured 8 " panels with DL06 and DL205 cells but have never tried multiple (serial coms were used on these cells).
One station will have a lot of I/O and one will only have a few points that I need to control. It is my understanding that the CMore is the master and it is not possible, I just wanted to verify this.
Can I run multiple panels thru a hub or is it possible to have one serial and one ethernet?
Option B is to locate a DL05 next to DoMore and use it as an interface. I only need to control 18 outputs on the smaller station.
Any ideas on the best way to get this doen would be appreciated.
Thanks in advance.