8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.7.8
Monitoring
devh
memory
Monitor data registration is the function that registers the name and the
number of the device to be monitored by the computer to the
AJ71C24.
The
monitor is the function that (a) reads the data content of the device
registered at the time the monitor read command is executed by the com-
puter, and (b) executes the corresponding processing such as monitoring.
The device numbers must be consecutive when the device
is
read using the
batch read
(BR,
WR/JR,
QR)
command. However, when this function is
used,
it
is possible to read and monitor the devices by designating the device
numbers at random.
r
L
c
(1)
Control procedure for monitoring
(
Monitor
3
Road
processing
(Executing monitor commands)
I
~~totheAcPu:MB,MJ
Dsd~~forthaArrAcpu:MJ,MQ
(CRT
display,
Btc.)
4
Change
monitor dm?
POINTS
(1)
As the flowchart shows, monitor data registration must be executed
before monitoring. Attempting to execute monitoring without register-
ing the monitor data will cause a protocol error.
(2)
The contents of the monitor data registration area are cleared when
the power supply is turned
OFF,
the
PC
CPU
is reset, or the mode is
switched.
(3)
For monitor registration, five types of registration are possible. They
are device memory in bit units
(BM
or
JM),
device memory in word units
(WM
or
QM),
and the extension file register
(EM).
r
c
c
8-44
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