Post by Admin on Jun 4, 2020 7:21:56 GMT -8
You still never mentioned the model number of AB PLC.
But if in fact, the AB PLC IP is "used for others thinks"[things], then that means there is already a cable in the ethernet port. It may go to a router, where you can use existing network/router to accomplish your goal. But if in fact any of the 3 PLCs are using their internet ports for other things, then you really need to get an IT person to look at all 3's setting, configuration and use, to come up with a viable solution that does not interfere with existing networking functions. Otherwise, you are just opening up a can of worms and will see much downtime. All my previous comments were based on the assumption you where setting up a new network where none existed previously. It is not wise to seek support for an existing network from someone online not familiar with the particulars of your setup. Best to get the company who set up the original network to advises you, or at a minimum, your company IT department to do it for you.
But generally speaking, you would use a network bridge/router to connect the different subnet masks. (Because like you said, you can not change PLC subnet mask). If for example, one PLC just uses ethernet to connect to one device, an HMI, then you would have to add a router in your configuration, or an additional Ethernet card/module on PLC(s). But there are many other variables in the networking setup. From complicated to as simple as opening RSLinks and adding the two siemens IP address to your ethernet driver in RSLinx.
But if in fact, the AB PLC IP is "used for others thinks"[things], then that means there is already a cable in the ethernet port. It may go to a router, where you can use existing network/router to accomplish your goal. But if in fact any of the 3 PLCs are using their internet ports for other things, then you really need to get an IT person to look at all 3's setting, configuration and use, to come up with a viable solution that does not interfere with existing networking functions. Otherwise, you are just opening up a can of worms and will see much downtime. All my previous comments were based on the assumption you where setting up a new network where none existed previously. It is not wise to seek support for an existing network from someone online not familiar with the particulars of your setup. Best to get the company who set up the original network to advises you, or at a minimum, your company IT department to do it for you.
But generally speaking, you would use a network bridge/router to connect the different subnet masks. (Because like you said, you can not change PLC subnet mask). If for example, one PLC just uses ethernet to connect to one device, an HMI, then you would have to add a router in your configuration, or an additional Ethernet card/module on PLC(s). But there are many other variables in the networking setup. From complicated to as simple as opening RSLinks and adding the two siemens IP address to your ethernet driver in RSLinx.