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3.28 Writing/Reading Device Data to/from Standard ROM
This function writes device data to the standard ROM. Writing the fixed values for operation and operation results to
the standard ROM can prevent losing data due to low battery. The data written to the standard ROM can be read at
any given timing by using an instruction.
(1) Setting procedure
Set the area, where device data are stored, to the standard ROM.
Project window [Parameter] [PLC Parameter]] [PLC File]
(2) Devices that can be written
• Internal user device (X, Y, M, L, B, F, SB, V, T, ST, C, D, W, SW)
• Internal system device (SM, SD)
• File register (R, ZR)
• Extended data register (D)
• Extended link register (W)
(3) Execution method
Use the SP.DEVST instruction to write device data to the standard ROM. The device data written to the standard
ROM are read to the specified device by the S(P).DEVLD instruction.
For details, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
Set a file size.
(The file name is fixed to
DEVSTORE.)
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