Mitsubishi Electric MELSEC-Q Series - Change of Transfer Target CPU-Side Device

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6.5.2 Change of transfer target CPU-side device
When LB/LW transfer data exceeds the B/W capacity (8K points) of the CPU module, changing the B/W capacity or
changing the transfer target CPU-side device to any other than B/W is needed.
The following is an example of CPU-side device setting for 32K-point LB and 128K-point LW data transfer.
For the Basic model QCPU or a safety CPU, refresh only the LB/LW that is used for the CPU module because the B/W
capacity of the CPU module (2K points) is too small. ( Page 210, Section 6.5.1 (1) (d))
(1) When using the extended link register (W) as a transfer target of LW (only the
Universal model QCPU other than the Q00UJCPU)
*1 The extended link register (W) is a device using the file register area.
For details on the extended link register (W), refer to the following.
User's Manual (Function Explanation, Program Fundamentals) for the CPU module used
*2 The file register capacity differs for each CPU module.
For capacity of each CPU module, refer to the following.
User's Manual (Function Explanation, Program Fundamentals) for the CPU module used
*3 Check the serial No. and software version for applicability. ( Page 606, Appendix 3)
*4 Processing time differs depending on the storage location.
A large number of processing points will cause a longer sequence scan time.
● It is convenient to use the following devices as target CPU-side devices of transfer from LW.
• When the transfer range value is 8K (1FFF
H
) or less: Link register (W)
• When the transfer range value is more than 8K (1FFF
H
): Extended link register (W)
● A file register can be used as a transfer target CPU-side device of LW. ( Page 216, Section 6.5.2 (2))
Since the extended file register (W) uses the file register area, configure the settings in both "PLC File" and
"Device".
Link-side device CPU-side device CPU-side device setting method
LW0 to 1FFFF W0 to 1FFFF
• Register a 128K-point extended link register (W) to the standard RAM or a
memory card (RAM).
*1*2*3*4
• Change the link register (W) points from 8K to 0K.
LB0 to 7FFF B0 to 7FFF • Change the link relay (B) points from 8K to 32K.