GlenOsborne
Lifetime Supporting Member
I have a spec that requires cable redundancy whether or not it makes sense. Also, I have to have redundant Processor Chassis where only one is powered at a time. I already have the Redundant processor system running on another project and that is easy. The Chassis are connected in a star network using 1756-ENTR cards and the two processors have the same IP address and as only one can possibly be on at a time, it all behaves itself perfectly.
My question is twofold. First and easiest:
Can I set up a 1756-EN2TR where both ports from every device runs to an unmanaged switch in a star network structure and provides cable redundancy (unplug any one cable and still have everything run)? (I know that this still would shut everything down if any one actual device failed except the PLC processor which can be manually switched to, and it primarily would be cable redundant.)
My second question might possibly require a diagram, but I'll try in words:
Can I set up a Device Level ring where I use two unmanaged switches, one for each ring direction coming out of the 1756-EN2TR on the PLC processor chassis so that I can switch between chassis and have one completely turned off at any point?
I would personally prefer to use the first method and I would just buy everything and test it, but Rockwell makes their equipment out of pure gold and if it is impossible I might have to do something stupid, like use devicenet.
Thank you,
Glen Osborne
My question is twofold. First and easiest:
Can I set up a 1756-EN2TR where both ports from every device runs to an unmanaged switch in a star network structure and provides cable redundancy (unplug any one cable and still have everything run)? (I know that this still would shut everything down if any one actual device failed except the PLC processor which can be manually switched to, and it primarily would be cable redundant.)
My second question might possibly require a diagram, but I'll try in words:
Can I set up a Device Level ring where I use two unmanaged switches, one for each ring direction coming out of the 1756-EN2TR on the PLC processor chassis so that I can switch between chassis and have one completely turned off at any point?
I would personally prefer to use the first method and I would just buy everything and test it, but Rockwell makes their equipment out of pure gold and if it is impossible I might have to do something stupid, like use devicenet.
Thank you,
Glen Osborne