**EDLCS****EDLCS**, `Option`

, `CID`

, `X1`

, `Y1`

, `Z1`

, `X2`

, `Y2`

, `Z2`

, `X3`

, `Y3`

, `Z3`

**Defines a local coordinate system for use in explicit dynamics
analysis.**

`Option`

Label identifying the option to be performed:

**ADD**
| — | Define a coordinate system (default). |

**DELE**
| — | Delete a coordinate system. If `CID` is
blank, all coordinate systems are deleted. |

**LIST**
| — | List defined coordinate systems. If `CID` is
blank, all coordinate systems are listed. |

`CID`

Coordinate system ID.

`X1`

, `Y1`

, `Z1`

X, Y, and Z coordinates of a point on the local x-axis.

`X2`

, `Y2`

, `Z2`

X, Y, and Z coordinates of a point on the local x-y plane.

`X3`

, `Y3`

, `Z3`

X, Y, and Z coordinates of the origin. `X3`

, `Y3`

,
and `Z3`

all default to zero.

## Notes

Local coordinate systems defined by this command are used in an explicit
dynamic analysis. For example, a local coordinate system may be used when
defining orthotropic material properties (see **EDMP**).

The coordinate system is defined by 2 vectors, one from the origin (`X3`

, `Y3`

, `Z3`

) to a point on the x-axis (`X1`

, `Y1`

, `Z1`

),
and one from the origin to a point on the x-y plane (`X2`

, `Y2`

, `Z2`

).
The cross product of these two vectors determines the z-axis, and the cross
product of the z-axis vector and x-axis vector determines the y-axis. If `X3`

, `Y3`

,
and `Z3`

are not specified, the global origin (0,0,0)
is used by default (as shown in the figure below).

The x-axis vector and the xy vector should be separated by a reasonable
angle to avoid numerical inaccuracies.

When you use the local coordinate system (defined by the **EDLCS** command)
to define a load (**EDLOAD** command), the direction of the
load will depend on the load type. For force and moment loads (`Lab`

=
FX, MX, etc. on **EDLOAD**), the load will be applied in the
direction of the local coordinate system defined by **EDLCS**.
For prescribed motion degrees of freedom (`Lab`

=
UX, ROTX, VX, AX, etc. on **EDLOAD**), the motion will act
in the direction of a vector from point (`X1`

, `Y1`

,` Z1`

)
to point (`X2`

, `Y2`

, `Z2`

)
as input on **EDLCS**. See the **EDLOAD** command
for more information.

This command is also valid in SOLUTION.

**Distributed ANSYS Restriction **This command is not supported in Distributed ANSYS.