Mitsubishi Q2ACPU User Manual page 81

7. AUTO REFRESH FUNCTION
(1)
I/O signal
Buffer memory
from a
address of a
master
master module
module
– –
– –
– –
– 0
110
– to
141
10
– to
41
– 1
Y(n+1A) *1 –
*1 –
Y(n+1B)
Parameter setting items, setting ranges and contents of auto refresh, as well as the
buffer memory address of the master module which is used for exchanging data with
the QnACPU are shown below.
Set the parameters for the number of the master modules used.
Item Setting range
Number of
master 0, 1 to 8 module(s)
modules
Number of I/O points of CPU
Start I/O No.
module
Model
classification
• MINI or MINI-S3
of MINI/MINI-
S3
Total number
of remote I/O 0 to 64 stations
stations
• X
Storage
• M, L, B, T, ST, C, D, W, R, ZR,
device for
none
received data
(Bit device: multiples of 16)
*4
• Y
Send data
• M, L, B, T, ST, C, D, W, R, ZR,
storage
none
device
(Bit device: multiples of 16)
Number of
0 to 32 times
retries
Link priority; CPU priority
FROM/TO
Priority selection of access
response
to the master module
specification
buffer memory
Data clear
specification
for Retention, clear (received data)
communication
faulty station
Description
• Sets the total number of the master modules used.
Set "0" if auto refresh is not to be used.
• Sets the head I/O number where the master module
is installed.
• MINI
In I/O mode (occupies 32 points)
• MINI-S3
In expansion mode (occupies 48 points)
• Set only when MINI is set.
• In MINI-S3, since the number of master module's
initial ROMs becomes valid, the setting is not
necessary .(When the setting is executed, ignore it).
• Sets the devices to store the received/send data for
batch refresh.
• Specify the head number of the device.
• The total number of remote I/O stations, set starting
from the first device number, is occupied as a auto
refresh area.
(8 points/station 64 stations = 512 points
*2
device)
• Use of X/Y remote I/O range is recommended for
devices.
• Sets the number of retries upon the communication
errors occurrence.
• Error is not output when the communication is
restored within the number of the retries set.
1) Link priority
• Link access by MINI-S3 has the priority.
During the link access, FROM/TO is caused to wait.
• Possible to read out the received data refreshed at
the same timing.
• The maximum wait time (0.3ms + 0.2ms
of separate refresh stations) for the FROM/TO
instruction may be generated.
2) CPU priority
• The FROM/TO instructions from a CPU module are
given access priority. Even during the link access, it
interrupts and accesses.
• Depending on the timing, received data in the midst
of I/O refresh may be read.
• No wait time for the FROM/TO instruction.
• Retention
Retains the received data for batch and separate
refresh.
• Clear
Sets all points to OFF
7 - 3
Default value
Follow the
settings
made in the
"I/O Assign"
in the
parameter
*3
mode.
X1000 to
X11FF
: Bit
Y1000 to
Y11FF
5 times
number
CPU priority
Clear