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4 DEVICES
4.6 File Register (R/ER)
4.6 File Register (R/ER)
Device capable of storing numerical data.
Types of file register
There are 2 types: the file register (R) and extended file register (ER)
File register (R)
The device held in the CPU built-in memory.
Extended file register (ER)
The device held only in the SD memory card. The extended file register (ER) function can be used with the programs
(dedicated instructions) or GX Works3.
• For supported version of extended file register (ER), refer to Page 942 Added and Enhanced
Functions.
• Extended file register (ER) can be used only when the SD memory card is inserted to the CPU module.
Extended file register (ER) function
Function to use the program (dedicated instructions)
Extended file register (ER) functions that can be used by applied instructions are shown below.
• ERREAD instruction: Reading function of extended file register (ER)
• ERWRITE instruction: Writing (transfer) function of extended file register (ER)
• ERINIT instruction: Batch initialization function of extended file register (ER)
For each applied instruction, refer to MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function
Blocks).
Extended file register (ER) function is not applicable to the file register (R) stored into the SD memory card by
the memory dump function.
■Reading function of extended file register (ER)
The current value of the extended file register (ER) stored into the SD memory card can be read from the file register (R) in
the CPU built-in memory by using ERREAD instruction.
The device number of data transfer source and data transfer destination is the same number. (When ER0 to 100 are read, the
values are stored to R0 to 100.) In using the ERREAD instruction, the maximum number of device points which can be read
from the extended file register (ER) is 32768.
■Writing (transfer) function of extended file register (ER)
The current value of the file register (R) in the CPU built-in memory can be written (transferred) to the extended file register
(ER) in the SD memory card by using ERWRITE instruction.
The device number of data transfer source and data transfer destination is the same number. (When R0 to 100 are written, the
values are stored to ER0 to 100.) In using the ERWRITE instruction, the maximum number of device points which can be
written to the extended file register (ER) is 32768.
■Batch initialization function of extended file register (ER)
All the points of the extended file register (ER) in the SD memory card can be initialized in a batch by using ERINIT
instruction.
If all the points of the file register (R) in the CPU built-in memory are initialized, you must write K0 by FMOV instruction, etc.
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