Programming For Partial Refresh Type 1/0 Units; Buffer Memory For Partial Refresh Station - Mitsubishi MELSEC-A AJ71PT3 User Manual

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5. PROGRAMMING
5.4 Programming for Partial Refresh Type 1/0 Units
Write programs as explained below to transfer 1/0 data of partial
refresh type remote 1/0 units.
See Section 5.5 for a fail-safe circuit activated at occurrence of a
communication error.
5.4.1 Buffer memory for partial refresh station
(1) Partial refresh station (addresses 250 to 282)
(a) Initial data for use of partial refresh type remote 1/0 units.
Specify the station numbers and the numbers of digits
(values obtained by dividing the numbers of input and
output points by 16).
Determine the number of digits in accordance with the
remote 1/0 unit manual.
(b) Buffer memory allocation is as indicated below:
Address
250
Station number
)
Data for 1st partial refresh station
251 Number of digits
252
Station number
Data for 2nd partial refresh station
253
Number of digits
280
Station number
Data for 16th partial refresh station
281
Number of digits
282 00
......
~
(c) Partial refresh station data is made up of two words per
remote 1/0 unit.
Station number...... May be specified between 1 and 64.
Number of digits.. ·.. ·Specify the number of partial re-
freshes performed for input and
output data in decimal.
K
~:;~:;~:;~:;
T
~Specify
the number of partial refreshes for input
. data in the range 0 to 16.
Specify the number of partial refreshes for
output data in the range 0 to 16.
The following example sets station number to 5 and the
number of partial refreshes to 4 for input data and 4 for
output data.
5 (Station number)
404 (Number of digits)
5-6
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18 INA) 66164-A