
1. GENERAL
B–62884EN/01
12
You can assign names or add notes to I/O signals, internal relays, and can
add notes to a sequence program.
They are generally called “symbol & comment data”.
(1) The definition of terms
The definition of terms are shown below to distinguish between some
symbol & comment data.
Terms Definition and uses Display
Symbol Name assigned
uniquely to each
relay/coil,
to be used in place of
PMC address.
X0.0 INPUT
Relay comment Text assigned to
relays/coils to
explain them.
X0.0 Y0.0
RELAY X
COMMENT
COIL Y
COMMENT
Coil comment Text assigned to coils
to explain them.
Y0.0
HERE IS COIL
COMMENT
Net comment Text assigned
between ladder nets
to explain them.
(* HERE IS NET *)
(* COMMENT *)
(2) Symbol & comment specification list
(a) For input signal and internal relay
Specification Symbol Relay comment Coil comment
Available
characters
ASCII characters
(lower-case
alphabetic
characters not
allowed)
ASCII characters
Japanese
kana/kanji
characters
ASCII characters
Japanese
kana/kanji
characters
Maximum cha. 16 byte 16 byte 30 byte
Maximum
number
20,000 entries
(Note)
20,000
(Note)
20,000
(Note)
Duplicated
definition
Not allowed Allowerd Allowerd
Note
Free area size of hard disk drive, EMS and XMS on personal
computer may restrict them.
1.3.2
About Symbol &
Comment Data