4. FUNCTIONS
MELSEC-A
4-12
The following symbols are used for the above device names.
Device
symbol
Device name
Device
symbol
Device name
X
Y
L
M
SM
F
TT
TC
CT
CC
TN
CN
D
SD
Input
Output
Latch relay
Internal relay
Special relay
Annunciator
Timer contact
Timer coil
Counter contact
Counter coil
Timer current value
Counter current value
Data register
Special register
TM
TS
CM
CS
A
Z
V
R
B
W
1R
to
48R
Timer setting value (main)
Timer setting value (sub)
Counter setting value (main)
Counter setting value (sub)
Accumulator
Index register
Index register
File register
Link relay
Link register
Expansion file register No. 1
to
Expansion file register No. 48
In addition, the variable name and the domain name length are 32 bytes (fixed), and any portion that
used up to 32 bytes is filled with spaces. The symbols that can be used are as follows:
_, 0 to 9, A to Z, a to z,!@#$%^&*()_+|-= []{}:;” ’`-<>?,./
(4) Specifies objects to be accessed
The data mentioned in (3) is set in the local OD, but when it will be used by a domain or in
accessing the MELSECNET/10 other terminal, the following data is stored in the expansion
address table.
•
Network No.
•
PC No.
•
Domain type
•
Device name
•
Device number
•
Y No.
•
Buffer memory address
The local OD abbreviation is shown below.
