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FX3G/FX3U/FX3UC 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/FX3UC PLCs only when the memory cassette is attached.
•FX
3U/FX3UC 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
.