
3.PERIPHERAL EQUIPMENT CONTROL HANDLING B-65395EN/01
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3.5 REFERENCE POSITION RETURN FUNCTION WITH DOGS
3.5.1 Explanation of Function
This function moves the machine movable part automatically or
manually in a specified direction to return to a reference position. This
method of reference position return is referred to as the grid method.
With this method, a reference position is determined by an electronic
grid position determined by the one-rotation signal of a position
detector.
The deceleration signal for reference position return (*DEC) is placed
in the same position as the high-speed interlock signal (*RILK) on the
built-in DI. So, when the reference position return function with dogs is
used, the high-speed interlock signal (*RILK) cannot be used.
3.5.1.1 Reference position return operation (grid method)
The machine movable part moves by rapid traverse when the jog feed
mode is set, 4 is set as function code, 15 is set as command data 1, and
feed toward a reference position is specified using the feed axis and
direction select signal (+X or -X).
If the deceleration signal for reference position return (*DEC) is set to 0
because a deceleration limit switch is pressed, the feedrate is reduced,
then movement continues at a low constant feedrate.
When an electronic grid position is reached after the deceleration limit
switch is released and the deceleration signal for reference position
return is set to 1 again, feed operation stops. At this time, the reference
position return completion signal (ZPX) is set to 1.
A reference position return direction can be set in a parameter.
The operation described above is shown in the timing chart below.
+X/-X
Function code = 4
Command data 1 = 15
Jog feed mode
V
Rapid traverse
rate
Each rotation of the detector
ZPX
*DEC
Grid (one-rotation signal)