
3. OPERATION
B–62884EN/01
228
(3) Reserved symbols
1) ; This special character is reserved for use in ladder data.
D A semicolon is used in the ladder data section to separate ladder
data from a comment. Characters that follow a semicolon are
treated as a comment. When a mnemonic file is converted back
to a source program, a semicolon and a comment that follows
it are not generated.
2) : This special character is reserved for use in ladder and I/O
module data.
D A colon is used in the ladder data section to separate a net
number from ladder data. Data that precedes a colon is treated
as a net number.
D A colon is also used in the I/O module data section to separate
a channel number from I/O module data. Data that precedes a
colon is treated as a channel number.
(4) Control character
The dollar character ”$” is used as control character in the mnemonic
file. Every dollar character in the sentence must be described as ”$$”
in the mnemonic file.
(a) Symbol and comment data
1) Description of address and symbol
Describe the address data and the symbol strings in a same line.
Describe the address data to top of line and the symbol strings
describe after address data with blank character or horizontal
tabulation character as delimitter.
| R0200.0 UNIT–3–POWER
Symbol
Blank character or horizontal tabulation character
Address
2) Description of relay comment and coil comment
Describe the relay comment and coil comment after address
defined in (1).
The first string between two single quotation marks after mark
”$1” is relay comment. And next string between two single
quotation marks is coil comment.
| $1 ’KEEP POWER ON’ ’KEEP UNIT-3 POWER ON’
Coil comment
Blank character or horizontal tabulation character
Relay comment
Mark of comment data
line (only ’$1’)
Blank character or horizontal tabulation character
When relay comment is not used, a part of relay comment must be
described by double single quotation marks.