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8
DATA COMMUNICATION USING THE PRE-DEFINED PROTOCOL
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(b) Timing for executing the UINI instruction
Communication protocol before change:
CH1 and CH2 are other than the predefined protocol mode.
Communication protocol after change:
CH1 or CH2 is the predefined protocol mode.
END
processing
Sequence
program
UINI
instruction
OFF
Completion
device
Completion
OFF
status
indication
device
OFF
Mode switching
signal (X6/XD)
Predefined
OFF
protocol
ready (X1D)
CH1 and CH2 are not in
predefined protocol mode.
QJ71C24N(-R2/R4)
Communication protocol before change:
CH1 or CH2 is the predefined protocol mode.
Communication protocol after change:
CH1 or CH2 is the predefined protocol mode.
END
processing
Sequence
program
UINI
instruction
OFF
Completion
device
Completion
OFF
status
indication
device
OFF
Mode switching
signal (X6/XD)
ON
Predefined
CH1 or CH2 is in
protocol
predefined protocol mode.
ready (X1D)
QJ71C24N(-R2/R4)
END
processing
Execution of UINI
ON
Setting processing
Communication not possible
END
processing
Execution of UINI
ON
Setting processing
Communication not possible
MELSEC-Q
END
END
processing
processing
ON
ON When failed
When completed
One scan
ON
CH1 or CH2 is in
predefined protocol mode.
END
END
processing
processing
ON
When failed
ON
When completed
One scan
ON
CH1 or CH2 is in
predefined protocol mode.
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