142
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.10 Extension Register [R] and Extension File Register [ER]
4.10.6 Functions and operation examples of extension file registers
Extension file registers (ER) are usually used as log data storage destinations and set data storage
destinations.
Extension file registers can be handled only with dedicated instructions shown in the table below. When
using data contents with other instructions, transfer them to an extension register of the same device number,
and then use the extension register.
However, extension file registers (ER) are available in FX
3U
/FX
3UC
PLCs only when the memory cassette is
attached.
• FX
3U
/FX
3UC
PLC
*1.
Extension file registers are only accessible when a memory cassette is mounted.
• FX
3G
PLCs
*2.
When the memory cassette is attached, extension file registers in the memory cassette are accessed.
When the memory cassette is not attached, extension file registers in the EEPROM built in the PLC
are accessed.
Instruction
Description
LOADR(FNC290) This (transfer) instruction reads data of extension file registers (ER)
*1
to extension registers (R).
SAVER(FNC291)
This (transfer) instruction writes data of extension registers (R) to extension file registers (ER)
*1
in 2048
point (1 sector) units. Use this instruction to store newly created sectors (2048 points) of data to
extension file registers (ER)
*1
.
INITR(FNC292)
This instruction initializes extension registers (R) and extension file registers (ER)
*1
in 2048 point (1
sector) units. Use this instruction to initialize extension registers (R) and extension file registers (ER)
*1
before starting to log data by the LOGR instruction.
LOGR(FNC293)
This instruction logs specified data, and writes it to extension registers (R) and extension file registers
(ER)
*1
.
RWER(FNC294)
This (transfer) instruction writes specified extension registers (R) to extension file registers (ER)
*1
.This
instruction is supported in FX
3UC
PLCs Ver.1.30 or later.Use this instruction to store the contents of any
extension register (R) to extension file register (ER)
*1
.
INITER(FNC295)
This instruction initializes extension file registers (ER)
*1
in 2048 point (1 sector) units. This instruction is
supported in FX
3UC
PLCs Ver.1.30 or later.Use this instruction to initialize extension file registers (ER)
*1
before executing SAVER instruction.
Instruction
Description
LOADR(FNC290) This (transfer) instruction reads data of extension file registers (ER) to extension registers (R).
RWER(FNC294)
This (transfer) instruction writes specified extension registers (R) to extension file registers (ER)
Use this instruction to store the contents of any extension register (R) in extension file registers (ER)
*2
.
