Mitsubishi Electric MELSEC Q Series Reference Manual page 347

(1) Setting data
*1
Setting data
Network No. of the own station (1 to 239, 254)
Jn
254: The network specified in Valid module during other station access
Start I/O number of the own station's CC-Link IE Controller Network module
Un
(00 to FE
Start device of the own station that stores control data
(S1)
(
(S2) Target station's start device where data to be read are stored
The own station's start device where readout data will be stored
(D1)
(A contiguous area for the read data length is required.)
The own station's device that is turned on for one scan upon completion of the
(D2) instruction
(D2)+1 also turns ON if the instruction execution has failed.
The target station's device that is turned on for one scan upon completion of the
(D3) instruction. (The target station can recognize that data have been read out with
the SREAD instruction.)
*1 Local devices and file registers for each program cannot be used as devices in setting data.
● 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 SREAD 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.
Good example (D50 is specified to (D1).)
Own station CPU
D50
D149
D150
Description
: The higher two digits of the 3-digit I/O number)
H
Page 335, Section 9.3 (2))
Other station CPU
D0
100 words
D99
D100
D150
D199
: Data to be read with SREAD instruction
: Area already used by own station's CPU
: Duplicated area
CHAPTER 9 DEDICATED INSTRUCTIONS
Bad example (D100 is specified to (D1).)
Own station CPU Other station CPU
100 words
9
Data type
Binary 16 bits
Device name
Bit
D0
D99
345