Three separate constraints to limit location, rotation and scale are provided to limit the respective transformation of an object. All these three constraints do not require a target object. The limiting parameter is set for the source/owner object.
Let us consider the limit location constraint. The lower and upper limit can be set for each axis- X,Y and Z separately or in combination like X and Y, Y and Z or Z and X or X ,Y and Z. Setting an upper limit of 5 along X axis would limit the movement of the object along X axis up to 5 units. The distance is considered from the initial position of the object origin to the limiting value set by us for the origin, of the source object. Setting the minimum and maximum value to zero along any axis will lock the movement of the object along that axis.
Clicking the For transform option will limit the movement with in the set minimum and maximum value, which we can see in the location parameters displayed in the properties panel. By unchecking the Transform option, you will see that the object is visually limited to move within the set parameters, but the actual value can go beyond the set limits. This again you can see under the location parameter.
Setting the Influence value to zero will make the limits set to become in-effective, setting it to 1 will make it effective on a100% basis. If the maximum value is set to 5, the object movement will be limited to 5. If influence is set to 0.5 and maximum value is set to 6, the object will be limited up to 3 units.
Similar logic is applicable to limit Rotation and Scale constraint.
Limit Distance constraint requires a target object with respect to which the limit operates.
