Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1469

• The following figure shows the execution timing of the SREAD instruction.
• When completed successfully
Sequence scan
Start contact
CPU module on
Completion device
the own station
(d2)
Completion status
indication device
(d2)+1
Device for storing the
read device (d1)
Network
module
Network
module
Sequence scan
Device where the
read data is stored
CPU module on
(s2)
the target station
Read notification
device (d3)
• When completed with an error
Sequence scan
Start contact
CPU module on
Completion device
the own station
(d2)
Completion status
indication device
(d2)+1
Completion status
(s1)+1
Network
module
• Read processing is performed only once on the rising edge when the read command turns on.
SREAD
0 END 0 END
ON
OFF
OFF
OFF
Channel n
0 END 0 END 0
100
ON
OFF
1 scan
SREAD
0 END 0 END
ON
OFF
OFF
OFF
Channel n
Target station error
0 END 0 END 0
OFF
ON
OFF
1 scan
100
END 0 END 0 END
OFF
0 END 0 END 0
OFF
ON
OFF
ON
OFF
1 scan
Error code
15 NETWORK COMMON INSTRUCTIONS
15.1 Link Dedicated Instructions
END
END
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