Siemens SINUMERIK 840D sl Function Manual page 1598

Z1: NC/PLC interface signals
19.5 Help function output to PLC (H2)
DB21, ... S functions 1 to 3
DBB98 - DBB115
Extended address S functions 1 to 3
Edge evaluation: No
Signal state 1 or Up to 3 S functions programmed in an NC block are simultaneously made available here as soon as
edge change the S change signals are available.
0 → 1
Value range of the spindle speed: 0 to 999 999; integer number
Value range of the extended address: 0 to 6; integer number
The S functions remain valid until they are overwritten by new S functions.
Signal state 0 or
● After the PLC has ramped-up.
edge change
● All help functions are deleted before a new function is entered.
1 → 0
Application exam‐ Spindle speed control by the PLC.
ple(s) The extended address is used to program for which spindle the S word is valid.
E.g.: S2=500
DB21, ...
DBB118 T function 1
Edge evaluation: No
Signal state 1 or The T function programmed in an NC block is made available here
edge change as soon as the T change signal is available.
0 → 1
Value range of T functions: 0 to 99 999 999; integer number
The T function remains valid until it is overwritten by a new T function.
Signal state 0 or
● After the PLC has ramped-up.
edge change
● All help functions are deleted before a new function is entered.
1 → 0
Application exam‐ Control of automatic tool selection.
ple(s)
Special cases, With T0, the current tool is removed from the tool holder but not replaced by a new tool (default
errors, ...... configuration of the machine manufacturer).
Remark 8 decade T numbers are only available as T function 1.
DB21, ...
DBB129 D function 1
Edge evaluation: No
Signal state 1 or The D function programmed in an NC block is made available here
edge change as soon as the D change signal is available.
0 → 1
Value range of D functions: 0 to 999; integer number
The D function remains valid until it is overwritten by a new D function.
Signal state 0 or
● After the PLC has ramped-up.
edge change
● All help functions are deleted before a new function is entered.
1 → 0
Application exam‐ Implementation of protective functions.
ple(s)
Special cases, D0 is reserved for deselecting the current tool offset.
errors, ......
1598
Signal(s) updated: job-controlled by NCK
Signal(s) updated: job-controlled by NCK
Signal(s) updated: job-controlled by NCK
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions