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MELSEC-Q
6 HIGH PERFORMANCE MODEL QCPU FILES
6.1 About the High Performance model QCPU's Memory
(1) User Memory
A user memory can be created within the memory of the High Performance
model QCPU by using the GX Developer/sequence program.
The High Performance model QCPU has the following built-in memories:
• Program memory
• Standard RAM
• Standard ROM
A memory card can be mounted on the High Performance model QCPU to
increase the size of a user memory.
(a) Programs used for arithmetic operations of the High Performance model
QCPU are stored in the program memory. Programs stored in the standard
ROM or on a memory card are booted (read) into the program memory for
arithmetic operation. A batch of parameters and programs stored in the
program memory can be copied to the standard ROM/memory card (Flash
card).
(b) Parameters and programs are stored in the standard ROM. These data are
used for ROM operation of the High Performance model QCPU.
(c) File register and local device data is stored in the standard RAM. The use
of file registers in the standard RAM will enable high speed access as is the
case with data registers.
(d) Memory card
A memory card can be connected to a memory card interface of the High
Performance model QCPU. This allows the read/write of data. The High
Performance model QCPU supports three types of memory cards: SRAM
card, Flash card, and ATA card.
1) The SRAM card allows the write/read of programs through a sequence
program in the following cases where:
• File registers are used in excess of the standard RAM capacity.
• Sampling trace data is stored.
• Failure history data is stored.
The use of file registers allows the write/read of data at 1017k points in
a sequence program.
2) The Flash card allows only the read through a sequence program. The
Flash card is useful when data written by the High Performance model
QCPU is read through a sequence program but no change is made to
the data.
The use of file registers allows a sequence program to read a
maximum of 1018 k points of data written by the High Performance
model QCPU.
3) The ATA card is used for PLC user data (general-purpose data).
Access to PLC user data stored on the ATA card can be made in CSV
format/binary format by using a file access instruction (e.g. FWRITE) in
a sequence program.
Содержание QCPU (Q Mode)
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