Mitsubishi Electric MELSEC Q Series User Manual page 146

When making multiple CPU settings of all CPU modules in multiple CPU system same, set "No specification" to "Host CPU
number".
If [No specification] is set at [Host CPU number], all CPU modules used in the multiple CPU system can share the same
multiple CPU setting.
(2) Timing of checking host CPU number
The host CPU number of the multiple CPU system is checked when the power supply of the programmable
controller is turned ON or when the CPU module is reset.
If the CPU No. set in the multiple CPU setting is not identical to the CPU No. determined by the mounting position
of the CPU modules, "CPU LAY ERROR (error code: 7036)" will occur.
In this case, the Universal model QCPU operates, regarding the CPU No. determined by the mounting position of
the CPU modules as correct.
Setting "Host CPU number" in the Multiple CPU settings of PLC parameter permits checking the auto refresh direction on the
following screens.
• Multiple CPU setting screen
• Auto refresh settings screen
• Multiple CPU high speed communication area assignment confirmation screen
Multiple CPU settings screen
Auto refresh settings screen
Figure 3.39 Direction of auto refresh using multiple CPU high speed transmission area
Select
Assignment
confirmation
Select Auto refresh setting
Direction of auto
refresh is checked
CHAPTER3 CONCEPT FOR MULTIPLE CPU SYSTEM
Multiple CPU high speed communication area
assignment confirmation screen
Select
PLC No.1
(Send)
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