Descriptions of the PLC subroutines
3.2 Conventions for the symbols used in the subroutines
PLC Subroutines Manual
32 Operating Instructions, 12/2012, 6FC5397-2EP10-0BA0
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
– P_: to PLC interface
– H_: to HMI interface
– N_: to NCK interface
– M_: to MCP interface
● Subsequent characters are for areas
– 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
● A symbol consists of a maximum of 11 upper case characters and numbers (including the
leading character). Except for underlines, you cannot use any other special symbols like
=, +, -, [ ], etc.
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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