System Variable - Siemens SINUMERIK 840D sl Function Manual

9.17.2.3

System variable

General Information
The replacement subprogram is provided with all of the information relevant to the functions
programmed in the block (T or TCA, D or DL, M) via system variables.
Exception
D or DL number is not transferred if:
● MD10719 $MN_T_NO_FCT_CYCLE_MODE, bit 0 = 1
● MD22550 $MC_TOOL_CHANGE_MODE = 1
AND
● D or DL are programmed together with the T or M function in a block.
System variable
System variable
$C_M_PROG
$C_M
$C_AUX_VALUE[0]
$C_ME
$C_AUX_EXT[0]
$C_AUX_IS_QUICK[0]
$C_T_PROG
$C_T
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
CAUTION
Values do not act
The values provided for the replacement subprogram in the system variables are not yet
effective. It is the sole responsibility of the user / machine manufacturer to resolve this by
using the appropriate programming in the replacement subprogram.
K1: Mode group, channel, program operation, reset response
9.17 Replacing functions by subprograms
Meaning
TRUE, if the M function has been programmed
For $C_M_PROG == TRUE, contains the value of address M
We must differentiate between two cases here:
● $C_M supplies the value if, for the tool change with M function,
a subprogram is configured with parameter transfer:
MD10715 MN_M_NO_FCT_CYCLE
● If only one subprogram is configured for the addresses T and/
or D/DL and if in the program the M function for the tool change
is programmed together with one of the addresses to be
replaced, then $C_M supplies the value: MD22560
$MC_TOOL_CHANGE_M_CODE
Value of the replaced M function
For $C_M_PROG == TRUE, contains the value of the address
extension of the M function
Address extension of the M function (identical to $C_ME)
TRUE, if the M function was programmed with quick output to the
PLC
TRUE, if the T function was programmed
For $C_T_PROG == TRUE, contains the value of the T function
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