Siemens Sinumerik 840D Operating Turning page 147

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Basic concepts - basic logic functions

4.1 Definition of main components:

Numerical Control

control in numerical form

Computerized Numerical Control, numerical control with one

or several microcomputer

Direct Numerical Control, oner or several CNC' s receive their

part programs from a central computer over a cable or

Programmable Logic Controller, a programable logic circuit.

is used in the machine tools for adjusting the control.

4.2 CNC basic functions:

A big colour monitor for the display, programming, simulation, opera-

tion and diagnosis.

Operation with interactive dialogue with at least two switchable for-

eign language options.

A bus-linked-, or integrated PLC to control the switching functions.

Software end switches as a substitution of mechanical end-switches.

Operational-/machine data logging, e.g. temperature error compen-

sation, variable space encoding of the tools, tool failure– and service life

Additional functions:

Powered tools

Data interface

Manual input

Correction values

Position set

Program test

Block masking/block search

Reapproaching the contour

840D/828D SINUMERIK Operate

Sinumerik 828d