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39
CHAPTER 2 APPLICATION OF PROGRAMMING
2
2.
2
I/O
Numb
er
2.
2.
1
Conce
p
t of
I
/O
num
ber assignm
ent
2.2
I/O Number
This section describes the I/O number assignment required for data communication between the CPU module or its
built-in functions and I/O modules or intelligent function modules.
2.2.1
Concept of I/O number assignment
(1) Purpose of I/O number assignment
I/O numbers can be assigned with any given number for the following purposes.
(a) Reserving points for future module changes
The number of points can be reserved to prevent the I/O number modification when the current module is
changed in the future to the one with the different number of occupied I/O points.
(b) Preventing I/O numbers from being changed
The change in the I/O numbers can be prevented when an I/O module or intelligent function module, whose
occupied I/O points are other than 16, is removed due to failure.
(c) Changing the I/O numbers to those used in the program
When the I/O numbers used in the actual system differ from those in the program, the I/O numbers of each
module can be changed to the ones in the program. If any of the I/O modules whose number of I/O points are
other than 16 fails without I/O assignment setting, the I/O numbers assigned following to the failed module may
change, leading to a malfunction. For this reason, making the I/O assignment setting is recommended.
(2) I/O number assignment
The I/O numbers are represented in hexadecimal. The following is an example of an I/O number assignment to
the L26CPU-BT.
The start I/O numbers are as below.
I/O number assignment is not necessary for the built-in Ethernet port, RS-232, and END cover.
Target
L02CPU L26CPU-BT
Default I/O assignment Default I/O assignment
Built-in I/O
0000
H
Change allowed
0000
H
Change allowed
Built-in CC-Link
⎯ ⎯ 0010
H
Change allowed
The module on the right side of a CPU module
0010
H
Change allowed
0030
H
Change allowed
Power
supply
module
Input
module
Intelligent
function
module
Input
module
Output
module
0030
to
003F
0040
to
005F
0060
to
006F
0070
to
007F
16
points
32
points
16
points
16
points
0000
to
002F
CPU module
(built-in I/O
and
built-in CC-Link)