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• The station type which can and cannot specify with the start I/O number is as follows.
Specification
Station type
possibility
Enabled
CC-Link master station, CC-Link master station (compatible with redundant function), CC-Link IE Field Network master station
Disabled
CC-Link local station, CC-Link standby master station, CC-Link IE Field Network local station, CC-Link IE Field Network submaster station
• Because the available range of the station number is 1 to 120, the station number for the master station in n1 cannot be
specified to (S1)+0. If the station number is specified, the "OPERATION ERROR" (error code: 4102) occurs.
• SM739 (Refresh device write/read instruction in execution flag) turns on during the instruction execution. When SM739 is
on, the following instructions cannot be executed.
• S(P).REFDVWRB
• S(P).REFDVWRW
• S(P).REFDVRDB
• S(P).REFDVRDW
If these instructions are executed, no processing is performed. When an error is detected at the instruction execution (before
SM739 turns ON), the completion device ((D2)+0), the completion device ((D2)+1), and SM739 do not turn on.
• The instruction completion can be checked in the completion device ((D2)+0 and (D2)+1).
• Completion device ((D2)+0)
The device turns on at the END processing in a scan where the instruction is completed and turns off at the next END processing.
• Completion device ((D2)+1)
The device turns on or off by the status when the instruction is completed.
Normal completion: No change from off
Error completion: The device turns on at the END processing in a scan where the instruction is completed and turns off at the next END processing.
Sequence program
S(P).REFDVRDW instruction
Refresh device write/read
instruction in execution flag
Completion device
Completion device + 1
• A module set parameters by the dedicated instruction and a CC-Link module operating by the automatic CC-Link startup
cannot be specified with the instruction.
• The read source (points in n2 from a device specified in control data) and read destination (points in n2 from (D1)) are
overlapped, data can be read. Read data starting from a device specified in control data when data are read to the smaller
device number. Read data starting from a device specified in control data + ((n2)-1) when data are read to the larger device
number.
8 INSTRUCTIONS FOR DATA LINK
844
8.3 Refresh Device Write/Read Instructions
END
Scan
processing
Instruction execution
(SM739)
Reading
device data
END
Scan
Scan
processing
processing
Error completion
END
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