7
- 16
7.4 MC Protocol Communication
7
COMMUNICATION USING BUILT-IN ETHERNET
PORTS OF CPU MODULE
(3) Available devices
Table7.4 lists the devices available in commands used in the MC protocol
communication function.
* 1 : Devices of DX/DY1000 or later are not available. Use X/Y devices to access devices of X/Y1000
or later.
Table7.4 List of available devices in Built-in Ethernet port QCPU
Classification
Device
Device code
Device number range
(Default)
Remarks
Internal system
device
Special relay
SM
000000 to 002047
Decimal
---
Special register
SD
000000 to 002047
Decimal
internal user
device
Input
X
000000 to 001FFF
Hexadecimal
Output
Y
000000 to 001FFF
Hexadecimal
Internal relay
M
000000 to 008191
Decimal
• When the device
number range is
changed, access is
possible up to the
largest device number
after the change.
• Local devices cannot
be accessed.
Latch relay
L
000000 to 008191
Decimal
Annunciator
F
000000 to 002047
Decimal
Edge relay
V
000000 to 002047
Decimal
Link relay
B
000000 to 001FFF
Hexadecimal
Data register
D
000000 to 012287
Decimal
Link register
W
000000 to 001FFF
Hexadecimal
Timer
Contact
TS
000000 to 002047
Decimal
Coil
TC
Current value
TN
Retentive timer
Contact
SS
000000 to 002047
Decimal
Coil
SC
Current value
SN
Counter
Contact
CS
000000 to 001023
Decimal
Coil
CC
Current value
CN
Link special relay
SB
000000 to 007FFF
Hexadecimal
Link special register
SW
000000 to 007FFF
Hexadecimal
Step relay
S
000000 to 008191
Decimal
Direct input
DX
000000 to 000FFF
Hexadecimal
*1
Direct output
DY
000000 to 000FFF
Hexadecimal
Index register
Index register
Z
000000 to 000019
Decimal
---
File register
File register
R
000000 to 032767
Decimal
ZR
000000 to 3FD7FF
Hexadecimal
Extended data
register
Extended data register
D
• Binary:
000000 to 4184063
(4086k points
maximum)
• ASCII:
000000 to 999999
(976.6k points
maximum)
Decimal
If the number of points is
set on the PLC file tab of
PLC parameter, access
is possible up to the
largest device number
after the setting.
However, in the ASCII
code communication, the
number of points
described on the left is
the access limit.
Extended link
register
Extended link register
W
000000 to 3FD7FF
(4086k points maximum)
Hexadecimal
If the number of points is
set on the PLC file tab of
PLC parameter, access
is possible up to the
largest device number
after the setting.