6
FUNCTIONS
6.30 Write/Read Device Data to/from Standard ROM
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6.30 Write/Read Device Data to/from Standard ROM
(1) Definition of write/read device data to/from standard ROM
Note93
Write/read the device data to/from the standard ROM is to write any device data to the
standard ROM. Writing the fixed value used for operation and operation result to the
standard ROM can prevent data disappearance at the time of low battery. Also, the
data written to the standard ROM can be read by any timing using the instruction.
(2) Execution method
Device data is written to the standard ROM by the SP.DEVST instruction. Also, the
device data written to the standard ROM is read to the specified device by the
S.DEVLD instruction.
(3) Device writable to standard ROM
Table6.65 shows the devices writable to the standard ROM.
* 1: The extended data register (D) is also included.
* 2: The extended link register (W) is also included.
Note93
Table6.65 Device writable to standard ROM and storage area
Device name
Storage area
X, Y, M, L, B, F, V, T, ST, C, D
*1
, W
*2
, SM, SD, SB, SW
Standard ROM (Device data storage file)
R, ZR
The Basic model QCPU, High Performance model QCPU, Process CPU, or Redundant CPU
cannot write/read the device data to/from the standard ROM.
Basic
High
Performance
Process
Redundant
Basic
High
Performance
Process
Note6.91
Note6.91
Note6.91
Note6.91
Redundant