Hal confusion

It can, but you must use the same signal name

You have two different signals (enable and estopactivated) connected to the same hal output

Ok - got it fixed - can't have 2 different signal names on a pin!

Pin names can only ever be used once (in, out... doesn't matter)

You get around this with signals. Signals names can be used repeatedly as often as you like on different lines and different hal files, but each signal name can only ever be connected to one output pin, but as many input pins as you like.