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4.
LINKING TO THE AnACPU (WITH DEDICATED INSTRUCTIONS)
AND THE AJ71 PT32-S3
MELSEC-A
4.2.2
Processing time
This section describes the processing time to write and read data
to and from
the buffer of an A64RDC.
(1)
Processing time required to write data
M a x .
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
I/O
refresh time can be found as shown in the following table:
Mode
i/O Refresh Time (msec) Operation
Mode Setting
Automatic return
(0)
t = 0.54
+
(0.058
x R)
+
(0.25
x B)
+
(0.95 x
T)
No
automatic return
(1)
t
=
0.66
+
(0.044
X
R)
+
(0.25
X
B)
+
(0.95
X
T)
Extension
Communications
s t o p
(48 points)
.
when an error is
detected (2)
t =
0.54
+
(0.051
X
R)
+
(0.25
X
B)
+
(0.95
X
T)
R : Total number of remote stations
6:
Number of AJ35PTF-128DTs
T: Number of remote terminal modules
4 - 7
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