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CHAPTER 2 CONCEPT OF MULTIPLE CPU SYSTEM
2
2.2 I/O Number Assignment
2.2.1 I/O numbers of I/O modules and intelligent function modules
2.2 I/O Number Assignment
A multiple CPU system uses the following two I/O numbers.
• I/O numbers used by CPU modules to communicate with I/O modules and intelligent function modules
( Page 27, Section 2.2.1)
• I/O numbers used by CPU modules to communicate with other CPU modules ( Page 30, Section 2.2.2)
2.2.1 I/O numbers of I/O modules and intelligent function modules
In the same way as in single CPU systems, I/O number "00
H
" is assigned to the I/O module or intelligent function
module mounted to the right of the CPU module. The subsequent I/O numbers are assigned sequentially to the right.
In multiple CPU systems, however, CPU modules may be mounted in slots 0 to 2 as well, and accordingly the start slot
of "00
H
" varies.
Ex.
When two CPU modules are mounted
Slot number
I/O number: 00
H
CPU01234567