Precautions For File Register Replacement - Mitsubishi Electric MELSEC Q Series Handbook

7
REPLACEMENT OF PROGRAM

7.7.11 Precautions for file register replacement

This section provides precautions for replacing the AnSCPU or QnASCPU using file registers with the
QCPU.
Storage destination
Maximum number of
points
Number of points for 1
block
*1 The High-speed Universal model QCPU cannot store the file register into an SD memory card.
*2 The High-speed Universal model QCPU can store up to 4608K points into the standard RAM when the extended SRAM
cassette for 8M bytes is used.
(1) Changing storage destination after replacement
(a) Changing storage destination after replacement of the AnSCPU
The value whose capacity has been set with the parameter of AnSCPU is not converted, since the
storage destination is different.
Set the storage destination and capacity (points) in the file setting of the PLC parameter setting.
Be sure to select "Use the following file" when setting the storage destination.
Selecting "Use the following file" makes the file equivalent to the AnSCPU.
(b) Changing storage destination after replacement of the QnASCPU
Drive No. for storing file registers differs between the QnASCPU and QCPU.
Set the parameters (Standard RAM, memory card (RAM)
drive where the file register is stored.
*3 The High-speed Universal model QCPU cannot be used the memory card (RAM) and memory card (ROM).
(2) Number of points for one block
1) Number of points for one block after replacement of the AnSCPU
For the AnSCPU with the extension file registers, the number of points for one block is 8k points.
For the QCPU, the number of points for one block is 32k points.
2) Number of points for one block after replacement of the QnASCPU
Definition of file register capacity is the same for the QnASCPU and QCPU.
When the storage destination and maximum number of points are the same, program adjustment
for file registers is not required.
AnSCPU
Memory cassette
Depends on applicable memory
cassette used
8k points
QnASCPU
Memory card
(Up to 1 cards, 2 drives)
1018k points
(When using 2M memory cards)
32k points
*3
, memory card (ROM)
QCPU
• Standard RAM
*1
• Memory card (1 card)
Standard RAM: Up to 512k
*2
points
(Depending on CPU model)
+ 4086k points
(When using a 8M memory card)
32k points
*3
) according to the
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