Conventions For The Symbols Used In The Subroutines - Siemens SINUMERIK 808D Operating Instructions Manual

Descriptions of the PLC subroutines

3.2 Conventions for the symbols used in the subroutines

3.2 Conventions for the symbols used in the subroutines
The symbols used in the subroutines follow the conventions listed below:
● Leading characters designate the destinations of interface signals
● Subsequent characters are for areas
● A symbol consists of a maximum of 11 upper case characters and numbers (including the
Symbol tables 1 to 2
The symbol tables 1 to 2 are for the manufacturer-defined SINUMERIK 808D I/O. Here you
can define input/output tables for your machines.
Symbol tables 3 to 5, 7 to 13
These ten symbol tables are reserved for the subroutines.
Note
Important!
If the colour of a symbol is displayed in red, this indicates that the naming does not follow the
rules of the PLC Programming Tool. In this case, you must check:
 whether the name uses special symbols like =, +, -, [ ], etc..
 whether the leading character is a number.
If there is a red wave under a symbol name or address, it indicates that you have used the
same symbol name or address for another symbol (there is also a red wave under its name
or address). In this case, you must check the repeated name or address and change it.
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– P_: to PLC interface
– H_: to HMI interface
– N_: to NCK interface
– M_: to MCP interface
– N_: NCK
– C_: Channel
– 1_: Axes
– M_: MCP
Other short forms of the symbols
– HWL: Hardware Limit
– HW: Handwheel
– RT: Rapid Traverse
– TK: Traverse key
– ACT: Active
– SEL: Selected
leading character). Except for underlines, you cannot use any other special symbols like
=, +, -, [ ], etc.
Operating Instructions, 12/2012, 6FC5397-2EP10-0BA0
PLC Subroutines Manual