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APPENDICES
A
Appendix 2 Comparison with a Single CPU System
Item Single CPU system Multiple CPU system Reference
Access range
Access from CPU
module(s) to other modules
All modules can be controlled.
Relations between CPU modules
and other modules must be set in
"Control PLC" of PLC parameter.
Page 104,
CHAPTER 5
Access from GOTs Accessible
A GOT can access a High
Performance model QCPU of the
specified CPU No.
Manual for
the GOT
used
Access with instructions
using the link direct device
Accessible Only control CPU is accessible.
Page 104,
Section 5.2
Access to CC-Link Accessible Only control CPU is accessible.
Manual for
the CC-Link
system
master/local
module used
Access from peripherals
Accessible through a USB
cable/RS-232 cable or over
network
Accessible through a USB
cable/RS-232 cable or over
network.
For access to the Motion CPU, PC
CPU module, or C Controller
module, refer to the relevant
manual.
-
Clock function
Clock data used by
intelligent function modules
(such as the QD75)
Clock data of the High
Performance model QCPU is
used.
Clock data of the High Performance
model QCPU (CPU No.1) is used.
Page 99,
Section 4.4
Operation
Operation when a CPU
module is reset.
The entire system is reset by
resetting the High Performance
model QCPU.
The entire system is reset by
resetting the High Performance
model QCPU (CPU No.1).
(Resetting CPU No.2 to No.4
individually is not allowed.)
Page 102,
Section 4.6
Operation when a stop error
has occurred in a CPU
module
The system stops.
If a stop error has occurred in the
High Performance model QCPU
(CPU No.1), the system stops.
("MULTI CPU DOWN" (error code:
7000) occurs in CPU No.2 to No.4.)
If a stop error has occurred in CPU
No.2 to No.4, the operation depends
on the parameter setting
("Operation Mode").
Page 102,
Section 4.6
Communications
among CPU
modules
Communications by auto
refresh using the CPU
shared memory
Not supported
Total of 4 Settings per CPU module:
up to 2K words,
Total of all CPU modules: 8K words
Page 122,
Section 6.1.1
Communications by
programs using the CPU
shared memory
Not supported
Data communications is performed
by using the S.TO, FROM
instructions, and instructions using
the cyclic transmission area device
(U3En\G).
Page 150,
Section 6.1.3
Communications between
High Performance model
QCPU and Motion CPU
Not supported
Data communications is performed
by using five motion dedicated
instructions and three multiple CPU
transmission dedicated instructions.
Page 160,
Section 6.2,
Page 162,
Section 6.3.1
Communication between
High Performance model
QCPU and C Controller
module/PC CPU module
Not supported
Data communications is performed
by using the multiple CPU
transmission dedicated instruction.
Page 164,
Section 6.3.2