Mitsubishi Electric MELSEC-Q Series User Manual page 163

(3) Number of modules connected
(a) When two or more master/local modules are connected in one programmable
controller system
The automatic CC-Link startup function applies to a module with the smallest start I/O number only.
In a multiple CPU system, the function applies to a master/local module with the smallest start I/O number
among master/local modules controlled by each CPU module.
(b) Number of connectable network modules
When the automatic CC-Link startup is performed, the number of network modules that can be connected to
the CPU module of a master station is as follows.
The number of CC-Link IE Controller Network modules + the number of CC-Link IE Field Network master/local
modules + the number of MELSECNET/H modules  3
(4) Precautions
(a) When a system is changed during data link upon automatic CC-Link startup
When changing a system, such as a module replacement, during data link, execute a line test in all the
stations. If a station with a start station number used by another station returns, a station where data link is
already being performed (only a station with a station number used) may also go down.
(b) Use of a temporary error invalid station
When the automatic CC-Link startup is executed, a temporary error invalid station cannot be used.
(c) When using a Basic model QCPU
In a Basic model QCPU, the automatic refresh is performed only in stations with station numbers 1 to 32. The
automatic refresh is not performed in stations with a station number 33 or later. Read or write data from/to
those stations using an intelligent function module device (Un\G) or FROM/TO instructions.
CHAPTER 8 FUNCTIONS
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