12
CONCEPT OF MULTIPLE CPU SYSTEM
12.3 I/O Number Assignment
12.3.1 I/O number assignment for the module
12 - 11
9
DEVICE DESCRIPTION
10
MULTIPLE CPU SYSTEM
OVERVIEW
11
MULTIPLE CPU SYSTEM
CONFIGURATION
12
CONCEPT OF MULTIPLE
CPU SYSTEM
13
COMMUNICATIONS
BETWEEN CPU
MODULES
14
PARAMETERS ADDED
FOR MULTIPLE CPU
SYSTEMS
15
STARTING A MULTIPLE
CPU SYSTEM
16
TROUBLESHOOTING
12.3 I/O Number Assignment
In the multiple CPU system, I/O numbers are used for communication between each CPU
module and I/O modules or intelligent function modules, and for communication between
different CPU modules.
12.3.1 I/O number assignment for the module
The position (slot) of the I/O number 00H in the multiple CPU system is different from that
in the single CPU system.
Note that the order of I/O number assignment, I/O numbers for each slot and empty slots
are the same between both systems. ( CHAPTER 7)
(1) Position of I/O number "00H"
(a) Slots occupied by CPU modules
In the multiple CU system, CPU modules occupy the slots of the number set in the
<<Multiple CPU settings>> tab of C Controller setting utility.
(b) Mounting positions of I/O modules and intelligent function modules
Mount I/O modules and intelligent function modules from the right of the slots
occupied by CPU modules.
(c) I/O number assignment
Set "00
H" to the I/O module or intelligent function module mounted next to the
rightmost CPU module, and then assign consecutive numbers to the right.
Example: When the number of CPUs is set to 2
When the number of CPU modules to be mounted on the main base unit is less
than the value set in the <<Multiple CPU settings>> tab of C Controller setting
utility, set "CPU (Empty)" for any empty slots.
For the "CPU (Empty)" setting, refer to the following.
Page 12-1, Section 12.1
Figure 12.6 Position of I/O number "00H"
CPU 0 1 2 3 4 5 6 7
Slot numbe
I/O number: 00H
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