Siemens SINUMERIK 840D Programming Guide

15
04.00 Tables
15.2 List of s
y
stem variables
15

Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
15-549
15.2.27 Reading and writing PLC variables
Identifier Type Description: System variable/value range/index Part pro Sync O S
$A_DBB
INT $A_DBB[n]
Read/write data byte (8 bits) from/to PLC
n: Position offset within I/O area 0 – ...
RS W R W 4
$A_DBW
INT $A_DBW[n]
Read/write data word (16 bits) from/to PLC
n: Position offset within I/O area 0 – ...
RS W R W 4
$A_DBD
INT $A_DBD[n]
Read/write double data word (32 bits) from/to PLC
n: Position offset within I/O area 0 – ...
RS W R W 4
$A_DBR
REAL $A_DBR[n]
Read/write Real data (32 bits) from/to PLC
n: Position offset within I/O area 0 – ...
RS W R W 4
15.2.28 NCU link
$A_DLB
INT $A_DLB[n]
Read/write data byte (8 bits) from/to NCU link
n: Position offset within the link memory area 0 – ...
synchronized with main run
RS W R W 5
$A_DLW
INT $A_DLW[n]
Read/write data word (16 bits) from/to NCU link
n: Position offset within the link memory area 0 – ...
synchronized with main run
RS W R W 5
$A_DLD
INT $A_DLD[n]
Read/write data doubleword (32 bits) from/to NCU link
n: Position offset within the link memory area 0 – ...
synchronized with main run
RS W R W 5
$A_DLR
REAL $A_DLR[n]
Read/write Real data (32 bits) from/to NCU link
n: Position offset within the link memory area 0 – ...
synchronized with main run
RS W R W 5
$A_LINK_TRANS
_RATE
INT $A_LINK_TRANS_RATE
Number of bytes that can still be transferred via the NCU link
communication in the current IPO cylce.
R5

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