490NRP25300 Thermocouple module

Changing Feedrate: The command VR n allows the feedrate, VS, to be scaled between 0 and 10 with a resolution of .0001. This command takes effect immediately and causes VS scaled. VR also applies when the vector speed is specified with the ‘<’ operator. This is a useful feature for feedrate override. VR does not ratio the accelerations. For example, VR .5 results in the specification VS 2000 to be divided by two. Compensating for Differences in Encoder Resolution: By default, the DMC-21x2/21x3 uses a scale factor of 1:1 for the encoder resolution when used in vector mode. If this is not the case, the command, ES can be used to scale the encoder counts. The ES command accepts two arguments which represent the number of counts for the two encoders used for vector motion. The smaller ratio of the two numbers will be multiplied by the higher resolution encoder. For more information, see ES command in the Command Summary.

Tangent Motion

Several applications, such as cutting, require a third axis (i.e. a knife blade), to remain tangent to the coordinated motion path. To handle these applications, the DMC-21x2/21x3 allows one axis to be specified as the tangent axis. The VM command provides parameter specifications for describing the coordinated axes and the tangent axis.Before the tangent mode can operate, it is necessary to assign an axis via the VM command and define its offset and scale factor via the TN m,n command. m defines the scale factor in counts/degree and n defines the tangent position that equals zero degrees in the coordinated motion plane. The operand _TN can be used to return the initial position of the tangent axis.

Tangent Axis 

Assume an AB table with the C-axis controlling a knife. The C-axis has a 2000 quad counts/rev encoder and has been initialized after power-up to point the knife in the +B direction. A 180° circular cut is desired, with a radius of 3000, center at the origin and a starting point at (3000,0). The motion is CCW, ending at (-3000,0). Note that the 0° position in the AB plane is in the +A direction. This corresponds to the position -500 in the Z-axis, and defines the offset. The motion has two parts. First, A, B and C are driven to the starting point, and later, the cut is performed. Assume that the knife is engaged with output bit 0.

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