Siemens SINUMERIK 808D ADVANCED Training Manual page 87

PLC program
design and
adjustment
PLC subroutine library
A constant definition
Constant input symbol
Constant "1" ONE
Constant "2" ZERO
Zero output definition
Statistic type symbol
bit NULL_b
byte NULL_B
word NULL_W
Long word NULL_DW
808D ADVANCED Turning and Milling
All the addresses in PLC subroutine library are programmed by symbols.
All the signals of interfaces are named by symbols and arranged in
address different symbol table.
The name of symbols follows some conventions.
SM0.0
Please refer to the PLC subroutine library instructions.
M251.0
address symbol
M255.7
MB255
MW254
4~15
MD252
Page 87
List name
1 PP_1
...... ......
IS_MCP
16
......
......
s
Symbol list details
PP module 1 I/O defined by
manufacturer
......
Preset for manufacturer
Send to or from machine
control panel MCP
......
Commissioning Guide