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APPENDICES
A
Appendix 2 Comparison with a Single CPU System
Item Single CPU system Multiple CPU system Reference
Communications
among CPU
modules
Communications by auto
refresh using the CPU
shared memory
Not supported
Basic model QCPU = 320 points,
Motion CPU = 2048 points,
C Controller module = 2048 points,
PC CPU module = 2048 points,
Total of all CPU modules: 4416
points
Page 122,
Section 6.1.1
Communications by
programs using the CPU
shared memory
Not supported
Data communications is performed
by using the TO, S.TO, FROM
instructions, and instructions using
the cyclic transmission area device
(U3En\G).
Page 150,
Section 6.1.3
Communications between
Basic 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
Communications between
Basic 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
Scan time
Factors that increase scan
time
• Writing data during RUN
• Time reserved for
communication processing
• Writing data during RUN
• Time reserved for communication
processing
• Refresh processing among CPU
modules in the multiple CPU
system
• Waiting time
Page 192,
Appendix 4
Parameter
Parameters added for a
multiple CPU system
Not supported
• Number of CPU modules
("Multiple CPU Setting")
• Control PLC setting ("I/O
Assignment")
• Out-of-group I/O setting ("Multiple
CPU Setting")
• Operation mode when a stop
error has occurred in a CPU
module ("Multiple CPU Setting")
• Communication area setting
("Refresh Setting")
• Settings of some parameters
must be the same for all the CPU
modules while others can be set
individually for each CPU module.
Page 80,
Section 4.2.2,
Page 170,
Appendix 1
Precaution AnS/A series module Not supported
Page 188,
Appendix 3