3.11 Precautions on Using File Registers
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3.11
Precautions on Using File Registers
This section explains the precautions on using file registers in the QCPU.
(1) Setting file registers to be used
To use file registers, they need to be set in the PLC parameter or the QDRSET instruction. If
the file registers are not set, normal operations cannot be performed in the instructions that
use the file registers.
Even when file registers are not set in the PLC parameter, a program that uses file
registers can be created. For CPU modules other than the Universal model
QCPU, an error does not occur when that program is written to the CPU module.
Note that the data cannot be written/read correctly to/from file registers.
For the Universal model QCPU, an error occurs if the program that uses file
registers is executed.
(2) Reserving the file register area
(a) For High Performance model QCPU and Universal model QCPU
To use file registers, register them to the standard RAM/memory card and reserve the
file register area.
The following table shows memories that can use file registers for CPU modules.
: Can be registered
*1 : When a flash memory is used, only data read from file registers is applicable. (Data write to flash ROM is not
applicable.)
Remark
For the method for setting file registers and reserving a file register area, refer to
the following manual.
• QCPU User's Manual (Function Explanation, Program Fundamentals)
Memory
High Performance model QCPU,
Universal model QCPU
Standard RAM
Memory card
*1
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
Page 815: ......
