Mitsubishi Electronics FX3G User Manual

716

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

33 Extension File Register Control – FNC290 to FNC299

33.1 FNC290 – LOADR / Load From ER

2) In FX

/FX

3GC

PLCs

a) When a memory cassette is connected (A memory cassette can be connected only to FX

PLC.)

The contents (current values) of extension file registers (ER) stored in a memory cassette (EEPROM) with the
same numbers as the extension registers specified by

+n-1 are read, and

transferred to the extension registers specified by

+n-1 stored in the PLC's built-in RAM.

•Reading (transferring) is executed in device units. Up to 24,000 devices can be read (transferred).

b) When a memory cassette is not connected

In the program example below, the contents (current value) of extension file registers (ER) which are stored in
the EEPROM built in the PLC and have the same device numbers as extension registers

+n-

1 are read, and transferred to extension registers (R) which are stored in the RAM built in the PLC and have
the device numbers

to +n-1.

•Reading (transferring) is executed in device units. Up to 24,000 devices can be read (transferred).

FNC290

LOADRP

Command

input

E +1

E +2

E +3

E +n-2

E +n-1

+n-2

+n-1

Read

(transfer)

Extension file registers (ER)
inside memory cassette

Extension registers (R)
inside built-in RAM