10-1
Chapter 10. PLC Link Communication
10 - 1 Data Transfer
PLC link communication is a function for transferring data between the PLC and this controller. There are two
transfer types: “Cyclic data transfer” and “Triggered data transfer.”
The type of transfer can be set in the PLC link settings of the SLP-C7 Smart Loader Package.
The upper limits for the number of transfer processes and number of sheets are shown below.
Function
Maximum No. of
sheets
Maximum No. of
processes in 1 sheet
Total maximum No. of
sheets for the function
Total maximum No. of
processes for the function
Cyclic data transfer
4 sheets
32 lines
4 sheets
32 lines
Triggered data transfer 4 sheets
32 lines
z
z
Cyclic data transfer
Data from the controller can be transferred to the PLC periodically. Data can also
be transferred from the host device to the controller.
Major applications:
•
Saving controller data to the PLC
•
Monitoring controller data by the PLC for device management
The controller transfers data periodically as follows.
PLC
This device
D0000
D0001
D0002
D0003
M0010
(2) Read
(1) Cycle starts
(3) Write
(4) Notify
LOOP1 PV
LOOP2 PV
LOOP3 PV
LOOP4 PV
(1) The controller starts cyclic data transfer for the specified sheet at the timing of
the
[Cyclic transfer scan cycle]
setting.
(2) Data is read from the controller.
(3) The read data is written to the PLC.
(4) When transfer of the data specified for the sheet is complete, a completion
notification is written.
