Siemens SINUMERIK 840D Programming Guide

1
Flexible NC Programming 04.00
1.1 Variables and arithmetic
p
arameters
1
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

Siemens AG 2000. All rights reserved
1-24
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA)
−
04.00 Edition
The name of a system variable is always identified
by the "$" character followed by the specific names.
Overview of system variable types
1st letter Meaning
$M
Machine data
$S
Setting data
$T
Tool management data
$P
Programmed values
$A
Current values
$V
Service data
2nd letter
Meaning
N
NCK-global
C
Channel-specific
A
Axis-specific
Example:
$AA_IM
Meaning: Current axis-specific value in the machine
coordinate system.

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB