Understanding The Roles Of Each Area - Mitsubishi MELSEC AJ65BT-R2 User Manual

5 PRELIMINARY INFORMATION

5.6.2 Understanding the roles of each area

When using the buffer memory automatic update function, the information of each area
in the automatic update area designation ( R 2 10
The timing for carrying out automatic update in each area is determined by the R2.
The application of each area differs according to the timing.
(1) Role of each area
(a) Status storage area (
This area is used to store the error codes and transmission/reception data
information in the master station.
This area is required for initialization, so use it with the default settings.
1) Update timing (Update direction: R2 to master station)
The data in the R2 buffer memory is stored in the master station at the
following timing.
• Just before the R2 turns the transmission normal (error) complete
signal (RXn0/RXn1) ON.
• Just before the R2 turns the reception normal (error) read request
signal (RXn2/RXn3) ON.
• Just before the R2 turns the initialization normal (error) complete
signal (RXn4/RXn5) ON.
• Just before the R2 turns the EEPROM function normal (error)
complete signal (RXn7/RXn8) ON.
• Just before the R2 detects that the error reset request signal
(RY(n+1)A) is ON.
• Just after the R2 detects an error when transmitting data with the
monitor transmission function.
• Just before the R2 turns the initial data read complete signal
(RX(n+1)9) ON.
2) Error code, transmission/
reception data information
Transmitted at timing set
Master station
in status storage area!
H
R 2 10 to 13
H
1) Transmission
error complete!
R2
5 - 19
MELSEC-A
to 33 ) is important.
H
)
H