Degree of freedom label for coupled nodes (in the nodal coordinate system). If ALL, use all appropriate labels. Valid labels are: Structural labels: UX, UY, or UZ (displacements); ROTX, ROTY, or ROTZ (rotations, in radians). Thermal label: TEMP (temperature). Fluid label: PRES (pressure). Electric label: VOLT (voltage).

Tolerance for coincidence (based on maximum coordinate difference in each global Cartesian direction for node locations and on angle differences for node orientations). Defaults to 0.0001. Only nodes within the tolerance are considered to be coincident for coupling.

In coordinate system KCN, two nodes are coupled when the coordinates of the first node (on the low boundary) plus the increments DX, DY, and DZ match the coordinates of the second node (on the high boundary).

Node location increments in the active coordinate system (DR, Dθ, DZ for cylindrical, DR, D θ, DΦ for spherical or toroidal).

When KNONROT = 0, the nodes on coupled sets are rotated into coordinate system KCN (see NROTAT command description). When KNONROT = 1, the nodes are not rotated, and you should make sure that coupled nodal DOF directions are correct.

When KMID = 1, the midside nodes of the element edges are added to the coupled sets of the end nodes of edges with specified nodal DOFs, if the end nodes of an edge are coupled. By default (KMID = 0), the midside nodes are not included in the coupled sets.

When CEOPT = 1, the coupled sets are converted to constraint equations. Use this option to improve performance in a distributed-memory parallel (DMP) solution. By default (CEOPT = 0), the coupled sets are not converted to constraint equations.