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Siemens SINUMERIK 840D Operator's Manual Page 327

Computerized numerical control system for machine tools.
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Cycle support
Data block
Data transmission
program PCIN
Data word
Digital input/output
Dimensions in metric
units and inches
Drift compensation
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
Protected subroutine for executing a repetitive machining process on
the -> workpiece.
An NC code generated via "Expand operator interface" or a geometry
process consists of several lines.
In the "Program" operating area, the available cycles are listed under
the menu "Cycle Support". After selecting the desired machining cycle
the required parameters for the value assignment are displayed in
clear text.
1. Data unit of the -> PLC, which the -> HIGHSTEP programs can
2. Data unit of the -> NC: Data blocks contain data definitions for
global user data. These data can be initialized directly when they
are defined.
PCIN is an auxiliary program which is used to send and receive CNC
user data via the serial interface, such as e.g. parts programs, tool
offsets etc. The PCIN program can be executed under MS-DOS on
standard industrial PCs.
A data unit, two bytes in size, within a -> data block.
1. Control operating area
2. The control has both a self-diagnostics program and testing aids
for service. Status, alarm and service indicators.
Digital modules are signal transducers for binary process signals.
Position and gradient values can be entered in the machining program
in inches. The control can be set to a basic system regardless of the
programmed measuring system (G70/G71).
Differential Resolver Function: An NC function, which generates an
incremental zero offset in automatic mode in conjunction with an
electronic handwheel.
During the constant traversing phase of the CNC axes an automatic
drift compensation is performed for the analog speed control.


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