Detection Of Duplicated Control Station Or Station No - Mitsubishi Electric MELSEC Q Series Reference Manual

4.4.6

Detection of duplicated control station or station No.

Duplication of the control station or station No. can be detected as a cause of loopback or disconnection from the
network.
The CC IE Control diagnostics makes troubleshooting easy. (
When power is applied or when a disconnected station returns to the network, this function checks whether the control
station of the network and station No. are duplicated or not.
The following describes how each station behaves when duplication of the control station or station No. is detected.
(1) When turning ON all stations simultaneously
(a) When duplication of the control station is detected
Function
Cyclic transmission
Transient transmission
(b) When duplication of station No. is detected
Control station
No.1
Cyclic transmission performed
by stations No.1 and No.2
Normal station
No.3
Function
Cyclic transmission
Transient transmission
Control station
No.1
Control station
duplication
No cyclic transmission performed
on all stations
Normal station
No.3
Not performed on all stations.
Available for all stations.
Normal station
No.2
Station No. Station No.
duplication duplication
Normal station
No.3
Stations of duplicated station No. do not perform cyclic transmission.
Other stations, each of which has unique station No, perform cyclic transmission.
(When the control station has a duplicated station No, all stations do not perform cyclic
transmission.)
Not allowed for stations of duplicated station No.
Page 541, Section 10.4)
Control station
No.2
Control station
duplication
Normal station
No.4
Operation
Control station Normal station
No.1 No.2
Station No.
duplication
No cyclic transmission performed
on all stations
Station No.
duplication
Normal station Normal station
No.1 No.3
Operation
CHAPTER 4 FUNCTIONS
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