Siemens SINUMERIK 840D sl Function Manual page 39

CLDATA = "cutter location data" (tool position data according to DIN66215)
1)
GWPS = Grinding wheel peripheral speed
2)
ST = Special tools
3)
Note
The tool type has no significance in the turning tool groups.
Unlisted numbers are also permitted, in particular with grinding tools (400-499).
Tools
Function Manual, 06/2019, A5E47435126B AA
W1: Tool offset
2.4 Tool parameters
39