20 Change Detect DC Input Module (CD332)
4. I/O Allocation
4.2 Interrupt assignment
The T3 has 8 I/O interrupt programs, I/O#1 to I/O#8.
If one interrupt generation module (CD332) is used, the I/O#1 program is assigned to
the CD332. And the I/O#1 is activated when the CD332 generates an interrupt.
If two or more (up to 8) interrupt generation modules (CD332, etc.) are used, the
interrupt programs are assigned sequentially from the module allocated closest to the
T3 CPU.
For example, if 3 CD332s are used, the I/O#1, I/O#2 and I/O#3 are assigned
sequentially as follows.
T3 basic unit Expansion unit
0 1 2 3 4 5 6 7 89 0123456 7 8 9 10
P
S
I
F C
P
U
C
D
3
3
2
C
D
3
3
2
P
S
I
FC
D
3
3
2
As for the interrupt priority, the interrupt generation module which is allocated closest to
the T3 CPU has highest priority and followed by this order.
NOTE
General
I/O
General
I/O
General
I/O
I/O#1
In default, the T3’s I/O interrupt program and the interrupt generation module
are related as mentioned above. However user can change this relation
(assignment) by using the interrupt assignment function of the T3.
For this function, refer to the T3 User’s Manual - Function.
I/O#2 I/O#3