Mitsubishi MELSEC-A Series Programming Manual page 201

6. BASIC INSTRUCTIONS
Execution
Conditions
POINTS
(1) When the A2C is used, pulse signals cannot be output during 1 scan due
to data communication with I/O modules though partial refresh of output
(Y) is done with the SEG instruction. For details, refer to the A2CCPU
User's Manual.
(2) The "B" used in this instruction does not mean link relay, but means that
the refresh bit number is B (bit).
When the network is configured, it can be used for all link relays.
(1) Data must be set as shown below:
(2) Setting the head device number
The head device number of devices to be refreshed is set. If the number is set
between Yn0 and Yn7 (Xn0 and Xn7), refresh is done for the number of
specifi-ed points from Yn0 (Xn0), and if the number is set between Yn8 and YnF
(Xn8 and XnF), refresh is done for the number of specified points from Yn8
(Xn8).
(3) Setting the number of points refreshed
The actual points refreshed are (set value) × 8 points and may be up to 2048
points maximum.
B1 = 8 points
B2 = 16 points
BA = 80 points
BB = 88 points
B10 = 128 points
BFF = 2048 points
SET M9052
K4 K4
SEG Y010 B001
6 − 89
MELSEC-A
Specifies partial refresh.
Set the number of points
refreshed in blocks of 8 points.
(Valid for B only)
May be any of K1, K2, K3 or
K4. Function is always the
same.
Set the head device number.
(Valid for X, Y only)