Siemens SINUMERIK 840D sl Function Manual page 621

Parameterization: Replacement subprogram
The replacement subprogram is specified function-specific in the machine data:
Function
T
TCA
D/DL
Note
It is recommended that the same subprogram is used to replace T, TCA and D/DL functions.
Parameterization: Behavior regarding D or DL function with simultaneous T function
When D or DL and T functions are simultaneously programmed in a block, the D or DL number
is either transferred as parameter to the replacement subprogram or the D or DL function is
executed before calling the replacement subprogram. The behavior is configurable via:
MD10719 $MN_T_NO_FCT_CYCLE_MODE (parameterization of the T function
replacement)
Bit
0
System variable for transferring information
The replacement subroutine is provided with all of the information relevant to the functions
programmed in the block via system variables (see Section "System variable (Page 623)").
The data contained in the system variables refers to the block in which the function to be
replaced was programmed.
Parameterization: Time that the replacement subprogram is called
The call time of the replacement subprogram is set via:
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Machine data
MD10717 $MN_T_NO_FCT_CYCLE_NAME
MD15710 $MN_TCA_CYCLE_NAME
MD11717 $MN_D_NO_FCT_CYCLE_NAME
Value Meaning
0 The D or DL number is available in the subprogram in the form of a system variable
(initial state).
1 The D or DL number is calculated directly in the block.
Note:
This function is only active if the tool change was configured with M function:
MD22550 $MC_TOOL_CHANGE_MODE = 1
otherwise the D or DL values are always transferred.
K1: Mode group, channel, program operation, reset response
9.17 Replacing functions by subprograms
621