
B–61863E/15
7. LADDER DIAGRAM FORMATPMC SEQUENCE PROGRAM
375
Suitable symbols shall be attached to I/O signals as signal names
according to the following procedure.
(1) The names of all signals containing CNC signals and machine tool
signals are represented within 6 characters.
Alphanumeric characters and special symbols described in this
manual are all employable.
(2) For CNC´PMC signal names, signal names shown in the PMC
address table are employable as they are.
(3) CNC signals to be entered from the machine tool and CNC signals
to be sent to the machine tool are identified from each other by
prefixing X or Y to the start of these CNC´PMC signal names,
respectively. A single block input signal is represented as XSBK by
prefixing X, while a start lamp output signal is represented as YSTL
by prefixing Y, for example. However, when X or Y is prefixed to the
start of an CNC´PMC signal name, certain signal names exceed 6
characters. In such a case, omit the last character from such a signal
name (*SECLP´X*SECL)
A comment of within 30 characters can be inserted to a relay coil in a
sequence program and each symbol in a symbol table.
When relay coils are output signals to the machine tool, insert a detailed
description of the signal to all relay coils as the comment to be inserted
to the relay coil. Also insert a detailed description of the signal when other
auxiliary relays are significant in sequence control.
Be sure to insert detailed descriptions of machine tool–related input
signals, in particular, as comments in symbol tables.
Detailed comments are necessary as it is difficult to guess the meanings
of signals specific to the machine tool by judging the symbol name alone.
A line number should be attached to each line of the ladder diagram. For
details, refer to Sec. 7.3.
7.1.2
Signal Names
7.1.3
Comments
7.1.4
Line Numbers