Mitsubishi MELSEC-Q Series User Manual page 265

APPENDIX
Buffer in the intelligent device station
Buffers in master station and local
station
Device contents
Input relay
Output relay
Internal relay
Latch relay
Link relay
Timer (contact)
Timer (coil)
Timer (present value)
Retentive timer (contact)
Retentive timer (coil)
Retentive timer (present value)
Counter (contact)
Counter (coil)
Counter (present value)
Data register
Link register
File register
Special link relay
Special link register
Special relay
Special register
Devices other than shown above cannot be accessed.
When accessing a bit device, specify it with 0 or a multiple of 16.
App - 4
1: See the manual for the local station or the intelligent device station from which
data will be read. When the random access buffer is specified, specify the
addresses by setting the start address of the random access buffer memory as 0.
2: Indicates the maximum number of data items that can be read.
Specify the buffer memory size of the local station or the intelligent device station.
Also, specify the receive buffer area setting range to be set with a parameter.
3: When the counterpart PLC CPU is other than QCPU (Q mode)/QCPU (A mode)/
QnACPU/AnUCPU and reads the PLC CPU device, the setting range will be 1 to
32 words.
(1) Buffer memory in the CC-Link
Buffer Memory contents
Random access buffer
Remote input
Remote output
Remote register
Link special relay
Link special register
(2) Device memory in the PLC CPU
Name
Bit
X
Y
M
L
B
T
T
T
ST
ST
ST
C
C
C
D
W
R
SB
SW
SM
SD
Device type
Unit
Word
Hexadecimal
Hexadecimal
Decimal
Decimal
Hexadecimal
Decimal
Decimal
Decimal
Decimal
Decimal
Decimal
Decimal
Decimal
Decimal
Decimal
Hexadecimal
Decimal
Hexadecimal
Hexadecimal
Decimal
Decimal
MELSEC-Q
Access code Attribute code
00
H
20
H
21
H
22 04
H
24
H
63
H
64
H
Access code Attribute code
01
H
02
H
03
H
83
H
23
H
09
H
0A
H
0C
H
89
H
8A
H
8C
H
11
H
12
H
14
H
04
H
24
H
84
H
63
H
64
H
43
H
44
H
H
05
H
App - 4