Siemens SINUMERIK 840D sl Function Manual page 615

Measurement (M5)
8.1 Brief description
Channel-specific measuring
In the case of channel-specific measuring, a trigger event is programmed for a part program
block. This triggers the measuring operation and selects a measuring mode for performing
the measurements. The instructions apply to all axes programmed in this particular block.
Preset actual value memory and scratching
The preset actual value memory is initiated by means of an HMI operator action.
The calculated frame can be written to system frame $P_SETFRAME. The setpoint position
of an axis in the WCS can be altered when the actual value memory is preset.
The calculation is performed in the NC when a PI service is activated via
● HMI operator action or a
● Part program command from the measuring cycles.
The term scratching refers to both the workpiece measurement and the tool measurement.
The measurements can be initiated via the
● HMI operator action or via
● Measuring cycles.
Communication with the NC takes place via predefined system variables.
Workpiece and tool measurement
The position of the workpiece can be measured in relation to an edge, a corner or a hole.
To determine the zero position of the workpiece (workpiece zero W) or a hole, setpoint
positions can be added to the measured positions in the WCS. The resulting offsets can be
entered in a selected frame.
In the case of tool measurement, the control calculates the distance between the tool tip and
the tool carrier reference point T from the tool length specified by the user.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
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