Assigning a Node Number to the Node
Each individual node must have a numeric label called the node number, which is assigned when the node is defined. The node number must be a positive integer, and the maximum node number allowed is 999999999 (for information on integer input, see Input Syntax Rules). The nodes do not need to be numbered continuously.
An Abaqus model can be defined in terms of an assembly of part instances (see Assembly Definition). In such a model all nodes must belong to either a part, part instance, or, in the case of reference nodes, to the assembly. Node numbers must be unique within a part, part instance, or the assembly; but they can be repeated in different parts or part instances.