Extension Register [R] And Extension File Register [Er]; Numbers Of Extension Registers And Extension File Registers; Data Storage Destination And Access Method - Mitsubishi FX3U Series Programming Manual

FX /FX Series Programmable Controllers
3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4.9

Extension Register [R] and Extension File Register [ER]

Extension registers (R) are devices for extending data registers (D), and are backed up by the battery.
While a memory cassette is mounted, the contents of extension registers (R) can be stored in extension file
registers (ER).
mounted.
4.9.1

Numbers of extension registers and extension file registers

The table below shows numbers of extension registers (R) and extension file registers (ER).
(Numbers are assigned in decimal.)
FX /FX PLC
3U 3UC
*1. Available only while a memory cassette is mounted (because they are stored in the flash memory
inside a memory cassette.)
4.9.2

Data storage destination and access method

Because the memory for storing data is different between extension registers and extension file registers, the
access method is different as shown in the table below:
Data storage destination
Extension register
Extension file register
Difference in the access method
Reading in program
Writing in program
Display module
Data change
method
110
However, extension file registers (ER) are available only while a memory cassette is
Extension register (R)
(latched [battery backed] type)
R0 to R32767
32768 points
Device
Built-in RAM (latched [battery backed] area)
Memory cassette (flash memory)
Access method
Test operation in online mode of GX Developer
Batch writing by GX Developer
Computer link function
4.9 Extension Register [R] and Extension File Register [ER]
Extension file register (ER)
(file type)
ER0 to ER32767
32768 points
Data storage destination
Extension
register
4 Devices in Detail
*1
Extension file register
Only dedicated instructions
are enabled
Only dedicated instructions
are enabled
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