15
04.00 Tables
15.2 List of s
stem variables
15
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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