Siemens SINUMERIK 810D Programming Guide

13
12.98 Additional Functions
13.6 Link communication
(
SW 5.2 and hi
g
her
)
13
840D
NCU 571
840D
NCU 572
NCU 573
FM-NC 810D 840Di

Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
13-455
•
Relatively small data volume
•
Very high transfer speed,
therefore: Use is intended for time-critical
information.
•
These system variables can be accessed from
the
part program
and from
synchronized
actions
. The size of the memory area for global
NCU system variables is configurable.
When a value is written in a global system variable, it
can be read by all the NCUs connected after one
interpolation cycle.
Link variables are
global system data
that can be
addressed by the connected NCUs as
system
variables
. The
–
contents
of these variables,
– their
data type
,
–
use
, and
– position (
access index
) in the link memory
are defined by the user (in this case generally the
machine manufacturer).
Link variables are stored in the link memory.
After power-up, the link memory is initialized with 0.
The following link variables can be addressed within
the link memory:
•
INT $A_DLB[i] ; data byte (8 bits)
•
INT $A_DLW[i] ; data word (16 bits)
•
INT $A_DLD[i] ; double data word (32 bits)
•
REAL $A_DLR[i] ; real data (64 bits)
According to the type in question, 1, 2, 4 or 8 bytes
are addressed when the link variables are
written/read.
Index
i
defines the start of the respective variable in
relation to the start of the configured link memory.
The index is counted from 0 up.

Siemens SINUMERIK 810D Specifications

General

Brand	Siemens
Model	SINUMERIK 810D
Category	Control Unit
Language	English