Siemens SINUMERIK 840D sl Function Manual page 1121

PI service: DELETO
Delete function tool:
Deletes the tool assigned to the transferred T number with all cutting edges (in TO, in some
cases TU, TUE and TG (type 400), TD and TS blocks).
Parameterization
Signal
PIService
Unit
WVar1
PI service: MMCSEM
Semaphores for various PI services
For use by MMC and PLC
10 semaphores are provided for each channel. These protect critical functions for the
MMC/PLC. By setting the semaphore for the corresponding function number, several
MMC/PLC units can be synchronized with it in cases where a function contains a critical
section with respect to data to be fetched by the NCK. Semaphores are managed by the
MMC/PLC. A semaphore value of 1stipulates a Test & Set operation for the semaphore of
the specified function number. The return value of the PI service represents the result of this
operation:
• Checkback value Done := TRUE:
• Checkback value Error := TRUE with state = 3: Semaphore was already set, critical
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Type
ANY
INT
INT
Semaphore has been set, critical function can be called.
function cannot be called. The operation must be repeated later.
Note
On completion of the operation (reading data of this PI service) it is essential that the
semaphore is enabled again.
Value range
PI.DELETO
1, 2
Detailed description
2.12 Block descriptions
Meaning
Delete tool
TOA
T number
137