Are robots communicating to plc via ethernet or hard-wired signals? Either way, if you can get them to communicate a few signals b/w them, you may could get it to work. I only have two robots in one cell, so you may have difficulty with extra robots. Get the robots to look for the correct DI's and include what Erik mentioned also with the heartbeat signal so the robots know that comms are good b/w each other.
It may take some extra i/o for you, so if that option isn't available, then DCS or space may be the better alternative as mentioned.
There are connected by ethernet to plc but it's 14 robot in the same area I'am trying method by method to see the good one thanks