des cription:
$P_LINENO[n]
Supplies the last programmed line number of program level n.
Example:
$P_LINENO[0]
Supplies the line number of the program on program level 0 = main program level.

PLC with NC-Var-Selector:
Area: C[.]
Data module: SPARP
Variable: actLineNumber[.]
Area number = Channel number
line = 1
系统变量测试：
DEF real _Abc
G4F1
G0G91X1
n9999
_Abc=$P_LINENO[0]
G4F1
G0G91X1
Y1
N1234Z1
m2


最后编程的段号，如果所有程序段无“N...",读出的是空的。
PLC with NC-Var-Selector:
Area: C[.]
Data module: SPARP
Variable: lastBlockNoStr[.]

Area number = Channel number
line = 1
试验：
系统变量
$P_BLOCKNO[n]
Supplies the last programmed block number of program level n.
Example:$P_BLOCKNO[0]
Supplies the modal block number of the program on program level 0 = main program name.
MD 10284 $MN_DISPLAY_FUNCTION_MASK Bit0 must be = 1.
Block numbers programmed during DISPLOF cannot be read with $P_BLOCKNO.

DEF STRING[10] _ASD
G4F1
G0G91X1
Y1
n9999 Z1
_ASD=$P_BLOCKNO[0]
G4F1
G0G91X1
Y1
N1234Z1
m2