Precautions For Using File Registers - Mitsubishi Q00JCPU User Manual

9
DEVICE EXPLANATION

9.7.6 Precautions for using file registers

(1) When Basic model QCPU is used
An error will not occur if data are written/read to/from the file register numbers of 64k
points or more.
However, note that undefined data will be stored if data are read from the file
registers.
POINT
(2) When High Performance model QCPU, Process CPU or Redundant CPU
is used
(a) When file register No. not registered/of more than registered capacity is
(b) File register capacity check
POINT
The file register file (MAIN.QDR) of the Basic model QCPU cannot be deleted.
However, the file register contents can be deleted.(
used
1) When file register file is not yet registered
When the file register file is not yet registered to the CPU module, an error will
not occur if data is written/read to/from the file register.
Reading data from a file register results in the following:
• Undefined data is stored in the standard RAM.
• "0 " is stored in a memory card.
H
2) Write/read to/from file register number of more than registered capacity
(points)
An error will not occur if data is written/read to/from the file register number of
more than the registered capacity (points).
Reading data from a file register results in the following:
• Undefined data is stored in the standard RAM.
• "0 " is stored in a memory card.
H
When writing/reading data to/from the file register, check the file register capacity
so that data is written/read within the capacity (points) set to the CPU module.
1) File register capacity checking method
The available file register capacity can be checked in the file register capacity
storage register (SD 647).
The file register capacity is stored in SD647 in 1k point units.
* 1 : If a file register file is switched to another, the file register capacity of the currently selected file
register file is stored in SD647.
The "less than 1k points" surplus portion of a file register capacity is not stored.
In order to ensure an accurate "range of use" check, be sure to designate the file
register setting in 1k point (1024 points) units.
*1
9.7 File Register (R)
9.7.6 Precautions for using file registers
Section 9.7(3))
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