You could do it any of the above.
1). In Brian have your Estop as your input, go through a "Invert" lobe, then to your output you want to drop.
2). In Macro pump you can do the same as above watching LED800, to unset your output
3). You can also use one of your Enables 1, 2 or 3 as a control bit in your PLC When Mach is active (not reset) the Enable will toggle your NO, or NC control bit in what ever rung you have going to your convayor Reley/Enable.
Scott