M5: Measurement; Brief Description - Siemens SINUMERIK 840D sl Function Manual

M5: Measurement

8.1

Brief description

Channel-specific measuring
The trigger event programmed for channel-specific measuring in a part program block initiates
the measuring operation and specifies the measurement method used for the measurement.
The instructions apply to all axes programmed in this particular block.
Axial measurement
In the case of axial measuring, a measurement can be made from the part program and also
from synchronized actions. A measurement method, the encoder and the trigger events are
programmed. Whereby the trigger events are formed from the probe (1 and 2) and the trigger
criterion (rising/falling signal edge). Depending on the measuring task, several measured
values per measurement and trigger event can be recorded.
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 workpiece coordinate system. 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, 10/2015, 6FC5397-1BP40-5BA3
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