Mitsubishi Electric MELSEC Q Series Reference Manual page 336

● Specify devices of the target station's CPU within the range allowed for the own station CPU when reading data from the
devices with the READ instruction.
(Target station's start device (S2) where data to be read are stored) + (Read points - 1)  (End device No. of own station's
*1
CPU ).
*1 End device No. of the device in the own station, and whose device name is same as in (S2)
● Specify the own station's start device (D1) within the range allowed for storing read data.
When D150 and after the area in the own station's CPU has been already used
Ex.
Own station CPU
D50
D149
D150
● Use the file register (ZR) when specifying the extended data register (D) or extended link register (W) that is outside the
area of the own station CPU's data register (D) or link register (W). (Except for the Universal model QCPU)
For the calculation of the file register (ZR), refer to the following.
User's Manual (Function Explanation, Program Fundamentals) for the CPU module used
When 0K point is assigned to the data register (D) of another station CPU, and when all 32K points of the file
Ex.
register (ZR) are assigned to the extended data register (D)
D0
D12287
*1 A file register whose capacity is 32K points or more is required for the own station's CPU.
334
Good example (D50 is specified to (D1).)
Other station CPU
100 words
Own station CPU *1
D0
Data register
D12287
D12288
D32767
Bad example (D100 is specified to (D1).)
Own station CPU
D0
D99
D100
D150
D199
: Data to be read with READ instruction
: Area already used by own station's CPU
: Duplicated area
Other station CPU
ZR0
Extended
Specify with D0 to 12287.
data register
ZR12287
ZR12288
Specify with ZR12288 to 32767.
ZR32767
Other station CPU
D0
100 words
D99