Mitsubishi Electric MELSEC-L LD75P User Manual page 311

(1) Transmitting data when power is turned ON or CPU module is reset (
When the power is turned ON or the CPU module is reset, the "parameters", "positioning data" and "block start
data" stored (backed up) in the flash ROM is transmitted to the buffer memory.
(2) Transmitting data with TO instruction from CPU module (
The parameters or data is written from the CPU module to the buffer memory using the TO instruction.
At this time, when the "parameter area (b)
7004)", "control data" and "PLC CPU memo area" are written into the buffer memory with the TO instruction, it is
simultaneously valid.
*1 Parameter area (b): Parameters validated with the next each positioning control is started. ([Pr.8] to [Pr.10], [Pr.25] to
[Pr.42])
(3) Validate parameters when PLC READY signal [Y0] changes from OFF to ON
When the PLC READY signal [Y0] changes from OFF to ON, the data stored in the buffer memory's "parameter
*1
area (a) " is validated.
For [Pr.5], however, only the data obtained first after the PLC READY signal [Y0] changes from OFF to ON when
the power is turned ON or CPU module is reset becomes validate.
(Refer to  Page 118, Section 5.2 for details.)
*1 Parameter area (a): Parameters validated when PLC READY signal [Y0] changes from OFF to ON. ([Pr.1] to [Pr.7],
[Pr.11] to [Pr.24], [Pr.43] to [Pr.57], [Pr.70], [Pr.150])
The setting values of the parameters that correspond to parameter area (b) are valid when written into the buffer memory
with the TO instruction. However, the setting values of the parameters that correspond to parameter area (a) are not
validated until the PLC READY signal [Y0] changes from OFF to ON.
CHAPTER 7 MEMORY CONFIGURATION AND DATA PROCESS
*1
", "positioning data (No. 1 to 600)", "block start data (No. 7000 to
)
)
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