Mitsubishi FX3U Series Programming Manual

132
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.10 Extension Register [R] and Extension File Register [ER]
4.10 Extension Register [R] and Extension File Register [ER]
Extension registers (R) are the extended form of data registers (D).
The contents of extension registers (R) can be stored in extension file registers (ER). In FX3U/FX3UC PLCs, extension
file registers (ER) are available only while the memory cassette is attached.
4.10.1 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.)
1. FX3U/FX3UC PLCs
2. FX3G/FX3GC PLCs
*1. Available only while a memory cassette is mounted (because they are stored in the flash memory inside a
memory cassette.)
*2. These registers can be changed to the latched (battery backed) type by the parameter setting when the
optional battery is used. However, the latched range cannot be set.
*3. These registers are stored in the EEPROM built in the PLC, or in the EEPROM in the memory cassette when
the memory cassette is attached.
4.10.2 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
Difference in the access method
Extension register (R)
(latched [battery backed] type)
Extension file register (ER)
(file type)
R0 to R32767
32768 points
ER0 to ER32767
32768 points
*1
Extension register (R)
(General type)
Extension file register (ER)
(file type)
R0 to R23999
24000 points
*2
ER0 to ER23999
24000 points
*3
Device PLC Data storage destination
Extension register
FX3U/FX3UC Built-in RAM (latched [battery backed] area)
FX3G/FX3GC Built-in RAM
Extension file register
FX3U/FX3UC Memory cassette (flash memory)
FX3G Built-in EEPROM or EEPROM in memory cassette
FX3GC Built-in EEPROM
Access method
Extension
register
Extension file register
Reading in program 3
UOnly dedicated instructions are
enabled
Writing in program 3
UOnly dedicated instructions are
enabled
Display module 33
Data change
method
Test operation in online mode of GX Developer 3 ×
Batch writing by GX Developer 33
Computer link function 3 ×

Mitsubishi FX3U Series Specifications

General

Brand	Mitsubishi
Model	FX3U Series
Category	Controller
Language	English