1.
GENERAL DESCRIPTION
MELSEC-A
1.1
Features
The features of the AJ71C24-S8 computer link module (hereafter called the
AJ71C24
in
this manual) are given below.
1.1.1
Control
operations
In
data
communications
Data transmission operations between an AJ71 C24 and external devices (e,
g., computers) can be controlled using either the dedicated protocols
(*1)
or in the
no-protocol/bidirectional
mode. These control operations can be
selected individually with the RS-232C and
RS-422
ports
of
an AJ71C24.
(1) Communications using the dedicated protocols
Communications at the request of the computer
Data communications is always initiated
by
the computer.
Designated data is transmitted according to the request command
transmitted from a computer to an AJ71 C24.
It
is not necessary to create and change special sequence
programs in order to use an AJ71C24.
Read and write possible to and from all PC CPU devices
Data can be read from all
PC
CPU devices. This permits obser-
vation and monitoring of all operations, as well
as
the collection
and analysis of data. Data can be written to all PC CPU devices.
This permits production control and production directives to be
carried out.
An
AJ71 C24 can upload and download programs from a PC CPU.
PC
CPU programs (main sequence and subsequence control
programs and microcomputer programs), parameter data and
comment data are read by the computer and stored. When
required they can be written to
the
PC CPU to change the
program.
Remote RUN and STOP control of the PC CPU
The PC CPU can be remote-controlled by means
of
RUN and
STOP instructions from the computer.
When multiple computers and PC CPU modules are connected
to
a link with an AJ71C24 module, the input
(X)
signals
of
the
CPUs in the link can be turned
ON/OFF
using any computer in
the link. This function can immediately stop or simultaneously
start all
CPUs
in
the link.
(This function is called the global function of the AJ71 C24.)
Communications at the request of the
PC
CPU
The
PC
CPU transmits the data send request.
When the emergency data needs to
be
transmitted from a PC CPU
to a computer, the
PC
CPU transmits a send request to the AJ71C24
to make the computer execute an interrupt processing.
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