Siemens SINUMERIK 840D sl Function Manual page 5

Notation of system data
The following notation is applicable for system data in this documentation:
Signal/Data Notation
NC/PLC interface ... NC/PLC interface signal:
signals
Signal data (signal name)
Machine data ... machine data:
<Type><Number> <Complete
Designator> (<Meaning>)
Setting Data ... Setting data:
<Type><Number> <Complete
Designator> (<Meaning>)
Data types
The following elementary data types are used in the control system:
Type Meaning
INT Signed integers
REAL Figures with decimal point acc. to IEEE
BOOL Truth values TRUE (1) and FALSE (0)
CHAR ASCII characters
STRING Character string, number of characters in [...]
AXIS Axis names only
FRAME Geometrical parameters for moving, rotating, scaling, and
mirroring
Arrays can only be formed from similar elementary data types. Up to 3-dimensional arrays are possible.
Quantity structure
Explanations concerning the NC/PLC interface are based on the absolute maximum number
of sequential components:
● Mode groups (DB11)
● Channels (DB21, etc.)
● Axes/spindles (DB31, etc.)
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Example
When the new gear step is engaged, the following NC/PLC
interface signals are set by the PLC program:
DB31, ... DBX16.0-2 (actual gear stage A to C)
DB31, ... DBX16.3 (gear is changed)
Master spindle is the spindle stored in the machine data:
MD20090 $MC_SPIND_DEF_MASTER_SPIND (Position of
deletion of the master spindle in the channel).
The logical master spindle is contained in the setting data:
SD42800 $SC_SPIND_ASSIGN_TAB[0] (Spindle number
converter)
Value range
-2147483648 to +2147483647
±(2.2*10 to 1.8*10 )
-308 +308
1, 0
Corresponding to code 0 to 255
Maximum of 200 characters (no special
characters)
All axis identifiers in the channel
Preface
5