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5.
LINKING TO AN ACPU AND AN AJ71 PT32-S3
MELSEC-A
5.2.2
Processing time
This section describes the processing time to write and read data
to and from
the buffer area of an A64RDC.
(1)
Processing time required to write data
Max. processing time = 2 scan time
+
t msec x (number
of write data
words
+
7)
+
40 msec
(2)
Processing time required to read data
Max. processing time =
2
scan time
+
t msec x (number of read data
words
+
10)
+
40
msec
"t" indicates I/O refresh time. This value varies according to the number
of used remote modules and their type.
The 1/0 refresh time can be found as shown in the following table:
Mode
I
Operation
Mode
Setting
I
I/O Refresh
Time
(msec)
~~
1
G o m a t i c return
(0)-
1
t =
0.66
+
(0.044 x
R)
+
(0.25 x B)
+
(0.95 x T)
Extension
(48 points)
t =
0.54
+
(0.058 x R)
+
(0.25 x B)
+
(0.95 x
T)
No automatic return (1)
Communications stop
when
an error
is
detected (2)
t =
0.54
+
(0.058
X
R)
+
(0.25
x B)
+
(0.95
X
T)
R: Total number of remote stations
B: Number of AJ35PTF-128DTs
T: Number of remote terminal modules
5 - 8
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