Siemens SINUMERIK 840D sl Function Manual page 5

Technical information
The following notation is used 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 Boolean values: TRUE/FALSE
CHAR 1 ASCII character corresponding to the code
STRING Character string, number of characters in [...], maximum of
200 characters
AXIS Axis identifier
FRAME Geometrical parameters for translation, rotation, scaling,
and mirroring
Arrays can only be formed from similar elementary data types. Up to two-dimensional arrays are possible.
Quantity framework
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.)
Basic Functions
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Example
When the new gear step is engaged, the following NC/PLC
interface signals are set by the PLC program:
DB31, ... DBX16.0-16.2 (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
-2147483646 ... +2147483647
±(2,2*10 ... 1,8*10
-308 +308
TRUE ≠ 0; FALSE = 0
0 ... 255
Sequence of values with 0 ... 255
Axis identifier for all channel axes
Preface
)
5