Siemens SINUMERIK 840Di Function Manual page 1374

Detailed Description
2.12 Block descriptions
Value ranges of data types
Data type
REAL (Digits := 1)
REAL (Digits := 2)
REAL (Digits := 3)
REAL (Digits := 4)
Call example
CALL FC 13 (
2.12.20 FC 17: YDelta star/delta changeover
Description of functions
The block for star/delta changeover controls the timing of the defined switching logic such
that the changeover can be performed in either direction even when the spindle is running.
This block may be used only for digital main spindle drives and must be called separately for
each spindle.
The changeover operation is implemented via 2 separate contactors in a sequence involving
4 steps:
Step 1:
Step 2:
Step 3:
Step 4:
2-180
Representable numerical range
- 999999,9 to + 999999,9
- 99999,99 to + 99999,99
- 9999,999 to + 9999,999
- 999,9999 to + 999,9999
Row := MB 26,
ChrArray := "strdat".disp, //DB with name strdat in
Convert := M 90.1,
Addr := P#M 20.0,
DataType := MB 28,
StringAddr := MW 30,
Digits := B#16#3,
Error := M 90.2);
Delete the "Motor selection in progress" interface signal in the relevant axis DB
(DB 31, ... DBX21.5) and connect the changeover process using "Motor selection" A
(DB 31, ... DBX21.5).
As soon as the "Pulses enabled" = 0 (DB 31, ... DBX93.7) checkback signal and the
acknowledgment of the announced motor selection from the drive have appeared, the
currently energized contactor drops out.
The other contactor is energized after the time period set by the user in parameter
"TimeVal" has elapsed.
After a further delay, the changeover is signaled to the drive with "Motor selection in
progress" (DB31, ... DBX21.5).
//data element symbol table
//disp is declared as string[32]
//and assigned in full with characters
//Number to be converted
//Data type of the variables
//3 decimal places
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0