Character Restrictions
Safety program-
related name
Applicable characters
Re-
served
words
Multi-
byte
charac-
ter
com-
patibili-
ty
Case
sensi-
tivity
Maximum size
*1
(not including
NULL)
Char-
acter
code
Variable names
(including POU in-
stance names)
Usable characters
• 0 to 9, A to Z, and a to z
• _ (underlines)
Refer to Reserved Words
below for a list of the re-
served words.
Characters that cannot be
used together
• A text string that starts
with a number (0 to 9)
• A text string that starts in
an underline (_) character
• A text string that contains
two or more consecutive
underline (_) character
• A text string that ends in
an underline (_) character
• Identifiers formed from a
string of characters that is
prefixed or suf
fixed with
one or more expansion
characters or spaces
Refer to
Re-
served
Words
on page
6 - 18
below.
Not
sup-
ported
Not
case
sensi-
tive.
127 bytes
ASCII
POU definition
names
Full path of varia-
ble names
(Example: This in-
cludes the number
of characters for
the instance name
and period, which
is Instance-
Name.OutputVar-
iableName when
accessing the out-
put variable of a
function block.)
51
1 bytes
Device names 127 bytes
Variable com-
ments
None Sup-
ported
--- 127 bytes UTF-8
*1. The individual restrictions are as listed in the table. The actual upper limits depend on the overall program
capacity and memory capacity for variables.
Reserved Words
An error is detected during the program check for the following names.
• Use of the same name as any of the instructions that are described in the NX-series Safety Control
Unit Instructions Reference Manual (Cat. No. Z931)
•
Words that are reserved by the system
Names that Must Be Unique
The following names must be unique. A building error will occur.
• Global variable names in the same
Safety CPU Unit
• Variable names in the same POU
• Local variable names and global variable names
6 Programming
6 - 18
NX-series Safety Control Unit User's Manual (Z930)
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