9-4
Chapter 9. PLC Link Communication Function
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Triggered data transfer
Data from the controller is transferred to the PLC when the trigger device is
detected turning from OFF to ON. Data can also be transferred from the PLC to the
controller.
Major applications:
• Changing the controller settings (SP, PID, etc.) from the PLC
• Changing the controller operations (RUN/READY mode selection, etc.) from
the PLC
The controller executes triggered data transfer as follows.
PLC
Model C1M
D0000
M0000
D0001
D0002
D0003
M0010
(2) Read
(3) Write
(1) Trigger = ON
SP
RUN/READY
AUTO/MANUAL
Manual MV
Trigger device
(1) The controller reads the trigger device 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.
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