Mitsubishi Electric MELSEC Q Series Reference Manual page 430

● 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 ZNRD instruction
(Target station's start device (S1) 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 CPU, and whose device name is same as in (S1)
● 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
428
Good example (D50 is specified in (D1).)
Other station CPU
100 words
Bad example (D100 is specified in (D1).)
Own station CPU
D0
D99
D100
D150
D199
: Data to be read with ZNRD instruction
: Area already used by own station's CPU
: Duplicated area
Other station CPU
D0
100 words
D99