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5.2 High Performance Model QCPU, Process CPU, Redundant CPU, Universal Model QCPU
5.2.5 Standard RAM
5
MEMORIES AND FILES USED IN CPU MODULE
5.2.5 Standard RAM
(1) Definition of standard RAM
The standard RAM is a memory for using file registers, local devices, and sampling
trace files without installing a memory card.
The standard RAM used as file registers allows fast access like the data registers.
(2) Storable data
The standard RAM can store one file register file, one local device file and one
sampling trace file (a total of three files).
( Section 5.2.1(2))
POINT
1. If the volume of the files to be stored into the standard RAM exceeds the
standard RAM capacity, examine the following.
• Store the file into a memory card.
• Examine to reduce points of the file register, local device and sampling
trace.
However, note that in the case of 1. above, access speed will be lower than that
of the standard RAM.
2. If the sampling trace file is stored into the standard RAM, check the version of
the CPU module and GX Developer. ( Appendix 4)
(3) Before using the standard RAM
Before using the standard RAM, be sure to format it by GX Developer.
(a) Formatting
To format the standard RAM, choose [Online] [Format PLC memory] on GX
Developer, and select "Standard RAM" as the target memory.
Figure 5.21 Standard RAM formatting
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