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Overview
Section 7-1
Note
(1) The total number of words (in a normal operation) when No. of motion
tasks = 1, No. of Axes = 1, and without custom area allocations
(2) The total number of words (in a normal operation) when No. of motion
tasks = 8, No. of Axes = 32, and all of general I/O are allocated
7-1-2
About I/O Refresh
CPU and MC Units exchange various data mentioned above (allocated bits,
allocated DM, custom bit area, etc.) with each other asynchronously. There-
fore, the following behaviors may be encountered.
When the CPU Unit's
Cycle Time is shorter than
the MC Unit's Unit Cycle
Data will be notified to the MC Unit after the CPU Unit runs for several cycles.
Therefore, it is required to prepare the ladder program to confirm that data
has been notified from the CPU Unit to the MC Unit successfully.
Ex: Turn ON the origin search bit and then confirm that the busy flag of the
axis is turned ON.
When the CPU Unit’s
Cycle Time is longer than
the MC Unit’s Unit Cycle
Data will be notified to the MC Unit after the CPU Unit runs for 1 cycle.
When the CPU Unit’s
Cycle Time and the MC
Unit’s Unit Cycle are
exactly the same
There is a possibility that none of data is notified to the MC Unit. In this case,
set a longer or shorter Cycle Time for the CPU Unit.
7-1-3
Allocated Area List
Word Allocation Based on
the Unit Number
The bit area and the range of respective DM areas are allocated based on the
unit number of the Unit.
CPU Bus Unit Allocated Bit Area Words
25 words are allocated for each Unit starting from the word 1500.
Custom I/O Area
a_A
Setting
General I/O A
General I/O
0
160
a_B
Setting
General I/O B
General I/O
0
160
a_C
Setting
General I/O C
General I/O
0
160
a_D
Setting
General I/O D
General I/O
0
160
a_E
Setting
General I/O E
General I/O
0
160
a_F
Setting
General I/O F
General I/O
0
160
a_G
Setting
General I/O G
General I/O
0
160
a_H
Setting
General I/O H
General I/O
0
160
23 (See note
1.)
1551 (See
note 2.)
Area
Brev-
ity
Direction
Usage
Remark
No. of
words min.
No. of
words max.
Brevity
codes
Addresses in the CPU unit
n
CPU Bus Unit allocated bit area
words
Word 1500 – 1899
n = 1500 + 25
×
Unit Number
m
CPU Bus Unit allocated DM
area words
D30000 – D31599
m = 100
×
Unit Number
Unit Number
Bit area
Unit Number
Bit area
0
Word 1500-1524
8
Word 1700-1724
1
Word 1525-1549
9
Word 1725-1749
2
Word 1550-1574
10
Word 1750-1774
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