You can check whether an ICA calculation is possible for a node or main node. An ICA calculation can only be done if a signal controller is allocated to the node or main node.
1. Make sure that the desired main node is open in the junction editor.
2. On the Junction editor toolbar, click the 
Check ICA computability symbol.
A message indicates whether a calculation is possible for the displayed node or main node. If the calculation is not possible, the message states reasons for it. If it is possible, further information on the relevant data is given.
