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10-3
Chapter 10. PLC Link Communication
The controller executes triggered data transfer as follows.
PLC
This device
D0000
M0000
D0001
D0002
D0003
M0010
(2) Read
(3) Write
(1) Trigger ON
(4) Notify
LOOP1 SP
LOOP2 SP
LOOP3 SP
LOOP4 SP
Trigger device
(1) The controller reads the trigger device at the timing of the
[Triggered transfer
scan cycle]
setting in order to monitor the trigger device turning from OFF to
ON. When the trigger device is turned on, triggered data transfer starts.
(2) Data is read from the PLC.
(3) The read data is written to the controller.
(4) When transfer of the data specified for the sheet is complete, a completion
notification is written.
The triggered transfer scan cycle and triggered data transfer operations are as
follows.
Data transfer is started for all sheets for which trigger device = ON is detected.
Triggered transfer scan cycle
Trigger device
(ON/OFF by PLC)
Triggered data
transfer sheet 1
Trigger cannot be detected if PLC
ON/OFF is too fast for triggered scan
ON
OFF
Processing
Stopped
OFF confirmation ON confirmation