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Device descriptions
The following shows the overview of available devices.
For more details on devices, refer to the following manual.
MELSEC iQ-R CPU Module User's Manual (Application)
Device name
User device
Input
Output
Internal relay
Data register
Link relay
Link register
System Device
Special relay
Special register
Link direct device
Link input
Link output
Link relay
Link special relay
Link register
Link special register
Module access
Module access device
device
CPU buffer memory
CPU buffer memory access
access device
device
Fixed cycle communication
area access device
File register
File register
Pointer
Interrupt pointer
APPX
210
Appendix 4 Device List
Description
X
A device that provides CPU module with commands and/or data using an external device,
such as pushbutton, transfer switch, limit switch, or digital switch.
Y
A device that outputs the operation results of the program to a device, such as external
signal light/digital HMI/electromagnetic switch (contactor) /solenoid.
M
A device that is used as an auxiliary relay within the CPU module.
D
A device that stores numerical values.
B
A device that is used in a C Controller module when refreshing data between a network
module and a C Controller module.
W
SM
A device that is used to store the status of a C Controller module. The specification of
special relays is defined in a C Controller module.
SD
For details on the special relay, refer to the following section.
Page 211 Special Relay List
For details on the special register, refer to the following section.
Page 213 Special Register List
Jn\X
A device that directly accesses link relays and/or link registers in a network module on the
CC-Link IE Controller Network and/or CC-Link IE Field Network.
Jn\Y
Jn\B
Jn\SB
Jn\W
Jn\SW
Un\G
A device that directly accesses from the CPU module to the buffer memory of an intelligent
function module mounted on the main base unit and extension base unit.
U3En\G
A device that accesses memory used for reading/writing data among CPU modules in a
multiple CPU system, or for the CPU module built-in function such as Ethernet function
U3En\HG
ZR
A device that retains data while the power is OFF. It exists in the file storage area of the
device/label memory.
I
A device that performs a corresponding routine when using the interrupt function
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