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MELSEC-
A
8 OTHER FUNCTIONS
(1) Update timing for RW update function
The update of the data in the master module remote register (RW) and R2 buffer
memory is carried out at the following timing by the RW update function.
(a) Update interval set in the RW update interval time designation (
R2
40H)
(b) All timings at which following areas shown in section 5.6.2 communicate
1) Status storage area
2) Transmission area
3) Reception area
4) Initialization area
5) EEPROM function area
6) User registration frame area
7) Monitor transmission area
POINT
When using the RW update function and buffer memory automatic update function
simultaneously, make sure that the update areas do not overlap.
(2) Setting the buffer memory
When carrying out RW update, designate in the R2 buffer memory shown below.
R2 buffer
memory
address
Name Details
R2
40H
RW update
interval time
designation
Designate the data update interval time between the master
station's remote register (RW) and R2 buffer memory. (Unit:
100ms)
0 : Do not update RW.
1 to 32767 : Update RW.
R2
41H
RWw update
validity
designation
Designate the validity of the RWw update.
0 : Update invalid (default value)
1 : Update valid
R2
42H
RWr update
validity
designation
Designate the validity of the RWr update.
0 : Update invalid
1 : Update valid (default value)
R2
43H to
4A
H
RW refresh
destination
address
designation
area
Designate the R2 buffer memory address corresponding to
the master station side remote register (RW).
1) RWw (remote register write area:
R2
43
H, 45H, 47H, 49H)
2) RWr (remote register read area:
R2
44
H, 46H, 48H, 4AH)