ZestyMozzarella
Lifetime Supporting Member
Greetings to the forum. Wondering what experience exists out there for this problem I'm currently encountering with an Rx3i controller. Have six different LD blocks set up for six Modbus TCP/IP capable rectifiers. Using the GE PACSystems* RX7i, RX3i and RSTi-EP TCP/IP Ethernet Communications User Manual GFK-2224W, I have structured six different channels to go out and communicate open and closing connections with these rectifiers. My issue is, one or two channels work at the same time and when I add more, they start failing. It should be noted that these commands are going out over a two port ETM001 card. One port goes out to separate switch that connects to my rectifiers, the other goes out to a series of NIU racks.
When the channels try to communicate they get failures CRS codes such as invalid channel #, comm discarded; command issued before previous status completed, and channel already open (even though not active). A few things and considerations I have pondered:
* Can a single ETM001 using both ports separately on one IP, not handle both Modbus TCP/IP and NIU rack communications at the same time without overloading?
* ETM001 Max FTP Server Connections in settings is set to 2 = modulus. I think this has to be set to 16 high limit for maximum allowed connections, but if I change the previous integrator's modulus 2 setting, the NIU's seem to stop communicating back to my HMI (separate issue there).
* Is it possible the NIU (even though I see no code requesting channels on main or NIU racks) with their symbolic activity are utilizing channels I'm unaware of causing overlap channel issues, thus issuing my invalid channel requests?
I'm trying to use channels 1-6 for my rectifiers. I got one working online now, adding multiples is when the trouble starts. I should be able to have up to sixteen channels operating separately all at once, each sequenced properly, but not in order with one another? It should be able to do that according to documentation. Sorry for the long write, its a complicated issue. If anyone has experienced this and has any ideas, I'm all ears and thank you for any input you can provide
When the channels try to communicate they get failures CRS codes such as invalid channel #, comm discarded; command issued before previous status completed, and channel already open (even though not active). A few things and considerations I have pondered:
* Can a single ETM001 using both ports separately on one IP, not handle both Modbus TCP/IP and NIU rack communications at the same time without overloading?
* ETM001 Max FTP Server Connections in settings is set to 2 = modulus. I think this has to be set to 16 high limit for maximum allowed connections, but if I change the previous integrator's modulus 2 setting, the NIU's seem to stop communicating back to my HMI (separate issue there).
* Is it possible the NIU (even though I see no code requesting channels on main or NIU racks) with their symbolic activity are utilizing channels I'm unaware of causing overlap channel issues, thus issuing my invalid channel requests?
I'm trying to use channels 1-6 for my rectifiers. I got one working online now, adding multiples is when the trouble starts. I should be able to have up to sixteen channels operating separately all at once, each sequenced properly, but not in order with one another? It should be able to do that according to documentation. Sorry for the long write, its a complicated issue. If anyone has experienced this and has any ideas, I'm all ears and thank you for any input you can provide
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