Siemens SINUMERIK 840D sl Function Manual page 741

System variable for the transfer parameters of the M, T and D/D functions
The programmed values for the transfer to the replacement subroutine can be read using the
following system variable:
System variable
$C_T_PROG
$C_T
$C_TE
$C_TS_PROG
$C_TS
$C_D_PROG
$C_D
$C_DL_PROG
$C_DL
$C_M_PROG
$C_M
$C_ME
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.11 Subroutine call through NC language replacement
Remarks
TRUE if address T has been programmed
Value of address T (integer)
Address extension of address T
TRUE, if address T was programmed with the tool identifier of type
STRING
Value of the T address as tool identifier
(string, with tool management only)
TRUE if address D has been programmed
Value of address D
TRUE if address DL has been programmed
Value of address DL
TRUE if M function was programmed for tool change
Value of replaced address M (integer)
There are two different cases:
1. The replacement subroutine for the tool change configured with
MD10718 $MN_M_NO_FCT_CYCLE_PAR was called. $C_M
contains the value
MD10715
$MN_M_NO_FCT_CYCLE[$MN_M_NO_FCT_CYCLE_PAR].
2. In the case of a tool change with M code, only one replacement
subroutine was configured for the T and/or D/DL addresses. If the M
code for the tool change is programmed together with one of the
addresses to be replaced, the value of MD22560
$MN_TOOL_CHANGE_M_MODE is transferred to the replacement
subroutine.
Address extension of replaced M function
Detailed description
183