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Appendix 2 Comparison with a Single CPU System
Appendix 2 Comparison with a Single CPU System
This section describes comparison between a single CPU system and multiple CPU system.
(1) When a Basic model QCPU is used
*1 "Number of CPU modules" indicates the number set in "No. of PLC" of PLC parameter ("Multiple CPU Setting").
*2 When a module occupying two slots is mounted, the maximum number of mountable I/O modules is the number
obtained by "25 - (Number of CPU modules + 1)".
When a module occupying three slots is mounted, the maximum number of mountable I/O modules is the number
obtained by "25 - (Number of CPU modules + 2)".
*3 If a Motion CPU or PC CPU module is used in a multiple CPU system, the Q3RB, Q6RB, and Q6RP cannot be
used.
Item Single CPU system Multiple CPU system Reference
System
configuration
Maximum number of
extension levels
4 levels
Page 32,
Section 3.1.1
Maximum number of
mountable I/O modules
24
25 - (Number of CPU modules)
*1*2
Main base unit
*3
Q3B, Q3SB, Q3RB, Q3DB
Extension base unit
*3
Q5B, Q6B
Q6RB
Extension cable QC05B, QC06B, QC12B, QC30B, QC50B, QC100B
Overall extension cable
distance
Within 13.2m
Power supply module
*3
Q6P, Q6SP, Q6RP
Available
module
Basic model QCPU Function version A or later Function version B
Page 32,
Section 3.1.1,
Page 40,
Section 3.1.3
I/O module Function version A or later
Interrupt module No function version restriction
Intelligent function module Function version A or later
Function version B or later
(Function version A or later for the
QD62, QD62D, and QD62E)
Available
software
package
GX Developer Version 7 or later Version 8 or later
Page 65,
Section 3.4
Other than above
The same version can be used in both single CPU systems and multiple
CPU systems.