Mike Krell

I am not sure if i mentioned at any point that the PLC is a compactlogix. You cannot add multiple ethernet modules to a compact logix. What is a "managed unit"

I have a control network for all of my process equipment at the plant and i have a new machine that i just purchased that has its own network. I cant add these devices to my network because there is IO hardware that needs to stay on that local network. My thought was to connect this network to my existing network using a router. I would assume a router is the way to go, but if i was certain i wouldnt be posting this. the new machine has a subnet of 172.33.33.__ The PLC that is on this network is at 172.33.33.40. I am not certain what the addresses are of the other devices, but i'm not too worried about that. My existing network is on a subnet 10.31.67.___. There is a central router for the plant that has the gateway 10.31.67.31. I can authenticate through this router to access it remotely or i can hook up directly at the plant. My goal is to not just be able to connect to these devices from the subnet 10.31.67.___ but also to allow the PLC's to talk to each other. So my next question after "how do i simply join the networks?" is how do i let them talk to each other? i have been told a VPN is what i need, but thats a little over my head.

Cool. i am not really sure what to do at this point. My plan was to seperate these networks completely, but it sounds like i dont need to. I hope i can get some more help on what exactly i need to do.

I will find out if it has a managed switch. Are you saying i should put all the devices on the same subnet as my existing network, use a managed switch and configure it to limit the traffic with the IO?

I just purchased a machined that came with a Compact Logix L32E. It has one single Ethernet port on the front. This port is currently being occupied. It goes to a switch that also contains 2 AS-I Masters and the PanelView Interface. The compactlogix contains a 3rd party profibus card and an Input and Output Module. I need to put this controller and Panelview on my plant network, but i obviously dont want to attach all these devices to my network because i dont want to interrupt the IO communication. Does anyone have any ideas on how i should do this? My only idea is to get new as-i masters that are profibus and use the existing profibus scanner module to communicate to them. Then i can put the PLC and HMI on the plant network.

I think you might be on to something here. This is what i found in the knowledgebase: http://rockwellautomation.custhelp.com/cgi...040&p_olh=0

Is there a reason i should have block transfer logic? I have communication with the IO tags without any kind of block transfer logic. I dont have anything programmed to the RIO addresses yet. There are no atmel parts in this card. I am not sure what else to check for with respect to that. Could it have something to do with the cabling? Maybe the resistor size? i really doubt it but i figured i would ask. I am just using 100 ohm resistors on both ends.

I am not using Data Highway and I not connected to the card at all. I am configuring it by using the eithernet module in the rack and configuring it using rslogix5000. Its just odd that it loses connection and completely locks up the PLC. I am fairly certain its not a cabling issue because when i manually remove the connector and reconnect it it regains connection. The 1747-ASB says "run" on it when it is running. and everytime to get it back to communicating i need to pop the scanner out and pop it back in and then it works for another few minutes.

OK, well after some fiddling around with group numbers and sizes and stuff I got this thing to communicate. I even got the 5000 series PLC to read and write to the rack. However I have one major problem. After a few minutes or so the communication will drop and the 1747-ASB will read "noc". and the scanner stops functioning. Also, if i am connect to the PLC when this happens my connection locks up until i pull the scanner card out of the rack. What could be causing this? It must be some kind of configuration or something no?

I have purchased these cards to try and get communication via Remote IO. Has anyone ever actually done this? There is 24 dip switches on the 1747 Rack, half of which i am not sure what the purpose is. Which is probably the reason i cant get it to work. Who has had success with these?

Thanks for the quick reply. I have considered that. I am using the Prosoft module to communicate to some old 505 Racks. The primary reason i am doing this is for consolidation. I dont want a bunch of 500 series PLC's around if i can run everything off of essentially one 5000. Is there another communication method i should be looking into? I like profibus and I use it for just about everything. Does the 1747-ASB adapter use DataHighway?

I have an Allen Bradley SLC-5/03 PLC inside a few machines. i want to turn these PLC racks into remote bases that are controlled by a 1756-L55 5000 series Control Logix. I am currently using profibus to control a number of other bases so I was tring to find out if there is some kind of remote base card that can replace the PLC that uses profibus? Any ideas?

I have a counter tag that runs constantly that is picked up by wonderware. Shouldnt that be enough to maintain connection?

I have a counter tag that runs constantly that is picked up by wonderware. Shouldnt that be enough to maintain connection?