RobotStudio event

Roller table infeed does not work once system is added.

I have formed a roller table in feed system as per a video tutorial.  This works fine.  I add a second roller table system to in feed two components, again this worked fine until I added a system

Once system is added the source component forms on one in feed system, but not the other.  The linear movers do not seem to work, (speeds set at 500mm/sec).  I have tried activating with Smart component signal and with system signal activated from Rapid code.  Neither seems to work.  Can anyone advise on what I am missing?  [ABB RS 6.04.01 used].  Many thanks.