Host Cpu Number Of Multiple Cpu System - Mitsubishi Electric MELSEC Q Series User Manual

3.11 Host CPU number of multiple CPU system

Checking the host CPU number of the multiple CPU system is a function to check whether [Host CPU number] in
[Multiple CPU settings] of the PLC parameter is identical to the number of the host CPU which is actually mounted.
(The number of the host CPU which is actually mounted is determined by the mounting position of the CPU modules.)
Checking the host CPU number of the multiple CPU system is available when the following CPU modules are used.
• Universal model QCPU (except Q00UCPU, Q01UCPU, Q02UCPU)
• Motion CPU (Q172DCPU, Q173DCPU)
(1) Setting of checking the host CPU number
When checking the host CPU number of the multiple CPU system, set the CPU number of the CPU module
where parameters will be written in [Multiple CPU settings] of the PLC parameter.
The host CPU number is selected from [No specification], [PLC No.1], [PLC No.2], [PLC No.3], and [PLC No.4].
([No specification] is set by default.)
If [No specification] is set at [Host CPU number], the host CPU number of the multiple CPU system is not
checked.
Also, setting the host CPU number is not required for all CPUs.
For example, when the multiple CPU system is configured using three CPUs, the host CPU number can be set to
the CPUs No.1 and No.2, and no setting is made to the CPU No.3.
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Setting the host CPU number
Whether host CPU number
is consistent is checked
CPU
No.1
CPU No. determined by mounting position
Setting host CPU number
Figure 3.38 Example of setting host CPU number of multiple CPU system
Whether host CPU number is
consistent is checked
CPU
No.3
CPU No.2