Mitsubishi Electric MELSEC FX3U Programming Manual page 758

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2) In FX PLCs
3G
a) When a memory cassette is connected
The contents (current values) of extension file registers (ER) stored in a memory cassette (EEPROM)
having the same numbers with the extension registers specified by
transferred to the extension registers specified by
RAM.
Command
input
Extension file registers (ER)
inside memory cassette
E S
E S
E S
S
E
S
E
E S
• Reading and transfer are executed in units of device. Up to 24000 devices can be read and
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
to
S
built in the PLC and have the device numbers
Command
input
Extension file registers (ER)
inside built-in EEPROM
E
E
E
E
E
E
• Reading and transfer are executed in units of device. Up to 24000 devices can be read and
transferred.
756
FNC290
S
LOADRP
Read
(transfer)
+1
+2
+3
+n-2
+n-1
+n-1 are read, and transferred to extension registers (R) which are stored in the RAM
S
FNC290
S
LOADRP
Read
(transfer)
S
S +1
S +2
S +3
S
+n-2
S +n-1
33 Extension File Register Control – FNC290 to FNC299
to
S
n
Extension registers (R)
inside built-in RAM
S
S +1
S +2
S +3
+n-2
S
S +n-1
to
S S
n
Extension registers (R)
inside built-in RAM
S
S +1
S +2
S +3
S +n-2
S +n-1
33.1 FNC290 – LOADR / Load From ER
to +n-1 are read, and
S S
+n-1 stored in the PLC's built-in
S
+n-1.