Mitsubishi Electric Melsec Q Series User Manual page 215

6 DEDICATED INSTRUCTIONS
Control data
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POINT
(1) The SREAD instruction can be executed only when the target station is
Q/L/QnACPU.
(The SREAD instruction cannot be executed for an ACPU connected to the
MELSECNET/10 or Ethernet network systems.)
Therefore, the target station numbers should be the station numbers of
Q/L/QnACPU only.
(2) When reading data from the other station CPU module device with the SREAD
instruction, specify the device within the range applicable to the host station
CPU module.
(Head device number to be read in other station CPU module (S2)) + (number
of read points -1)
: Last device number in host station CPU module having the same device
name as (S2).
(3) Use the file register (ZR) when specifying the expansion data register (D) or the
expansion link register (W) that are out of area of the data register (D) or the
link register (W) on the host CPU module respectively (excluding the Universal
model QCPU and the LCPU).
For how to calculate areas for the file register (ZR), refer to the User's Manual
(Function Explanation, Program Fundamentals) for the CPU module used.
(Example) When not assigning the data register (D) of the other station CPU
module, or assigning all of the 32K points of the file register (ZR) to the
expansion data register (D).
Host CPU module
D0
Data register
D12287
1 File register with 32K points or more is required for the host CPU.
See Section 6.4 for how to handle the control data of the SREAD instruction when
reading from the word device memory of other stations.
The control data should be handled in the same way as when reading the word
device memory using the READ instruction. Thus, this section omits its
explanation.
The number of steps for the SREAD instruction is 10.
< (last device number of host station CPU module
Other station
1
CPU module
D0
Expansion data
register
D12287
D12288
D32767
MELSEC-Q/L
ZR0
Specify within D0 to 12287
ZR12287
ZR12288
Specify within ZR12288 to 32767
ZR32767
)
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