6 Memory Configuration and Data Operation
6.2 Data Transfer Process
38
FX
3U
-20SSC-H Positioning Block User's Manual
6.2
Data Transfer Process
6.2.1
Data transfer processing among the PLC, 20SSC-H and servo amplifier
The data transfer between PLC, 20SSC-H, and servo amplifier is as follows.
1. Power-on data transfer process [A in the figure above]
The following data transfer process occurs.
1) The data in the 20SSC-H flash memory is transferred to the buffer memory (BFM).
2) The servo parameters are transferred to the servo amplifier.
To transfer the servo parameters automatically to the servo amplifier at PLC power-on, set the following
parameter in flash memory and turn the power ON in order from the servo amplifier to the 20SSC-H
(including the PLC).
→
For details, refer to Subsection 6.2.3 and Section 7.1
- Save servo parameters that relate to the servo amplifier with the servo series (BFM #15000, #15200), to
the flash memory.
2. Data transfer between PLC and buffer memory (BFM) of 20SSC-H [B in the figure above]
Applied instructions such as the MOV instruction, or the FROM/TO instruction are used to read/write
parameters and data between the PLC and buffer memory.
Note
It is recommended to set positioning parameters, servo parameters and table information using FX
Configurator-FP, and then save them in the flash memory.
If they are set using a sequence program, it is necessary to create a complicated sequence program and use
many devices. As a result, the scan time will increase.
3. Writing data to the flash memory in 20SSC-H [C in the figure above]
To change data in the flash memory, use a sequence program or FX Configurator-FP to modify the buffer
memory data, then activate a save command (BFM #523 b0 to b6) to save positioning parameters, servo
parameters and table information from the buffer memory to the flash memory.
→
For the operation of FX Configurator-FP, refer to the FX Configurator-FP Operation Manual
→
For the flash memory save command, refer to Subsection 11.4.15
4. Data transfer process between 20SSC-H and servo amplifier [D in the figure above]
When servo parameters on the servo amplifier side are modified, the buffer memory of the 20SSC-H is (by
default) automatically updated.
For the initial servo parameter transfer method, refer to the following.
→
For the initial servo parameter transfer methods, refer to Subsection 6.2.3 and Section 7.1
F X
3 U
-20SSC-H
(A)
(B)
FX
3U
/FX
3UC
PLC
Sequence
program
Buffer memory (BFM)
- Positioning parameters
- Servo parameters
- Table information
- Monitor data
- Control data
Flash memory
- Positioning parameters
- Servo parameters
- Table information
(C)
(A)
(D)
Servo amplifier
- Servo parameters
Servo amplifier
- Servo parameters
