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6. DATA COMMUNICATIONS USING AN M
: N MULTIDROP LINK
MELSEC-A
6.2.2
Maximum data communications time per computer
Set the maximum time so that, after obtaining an access right, each com-
puter can perform data communications with PC CPUs.
(In the following figure, each of these
-
means time duration.)
Even if the computer that obtains the access right malfunctions, data com-
munications can b e done between other computers and PC CPUs by setting
the maximum data communications time.
Example
I
-
-
Time
This shows the range within
-
+
which a computer does not
computer,
-
------------
*
- -
-
- - - - -
-
- - -
Y
obtain the access right.
Set the maximum data communications time per computer to a time that
is sufficient for data communications with PC CPUs in the computer link
system.
After the computer link system starts, the computer that obtains the
access right must complete data communications with PC CPUs within the
maximum data communications time.
When unable to complete data communications, the computer with
the access right transmits the CL code to communicating PC CPUs
within the maximum data communications time, and initializes a
,
transmission sequence to an AJ71C24.)
I
While a computer and PC CPUs are performing data communications, the
time-out check function must be used with other computers to block data
transmission from those computers.
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