Mitsubishi Electric MELSEC-Q Series - Page 31

29
CHAPTER 1 OVERVIEW
1
1.1 Features
(d) Detection of a faulty cable
A cable fault can be detected as a cause of a communication error. ( Page 127, Section 4.4.4)
(e) Detection of a cable insertion error
Incorrect cable connection between OUT and IN can be detected as a cause of loopback or disconnection from
the network. ( Page 128, Section 4.4.5)
(f) Detection of a duplicated control station and duplicated station number
Duplication of the control station or station No. can be detected as a cause of loopback or disconnection from
the network. ( Page 129, Section 4.4.6)
Ex.
When a station is added to a network (Station No. duplication)
Control station
No.1
Normal station
No.4
Normal station
No.3
Normal station
No.2
A cable fault is detected as the
cause of the communication error.
Communication
error
Communication
error
Normal station
No.3
Normal station
No.4
Normal station
No.2
Control station
No.1
Incorrect cable connection between
OUT and IN is detected as the cause
of the loopback and disconnection.
OUTIN OUTIN
INOUT OUTIN
Cable
insertion error
Normal station
No.4
Normal station
No.4
Normal station
No.3
Normal station
No.2
Control station
No.1
When a normal
station of a duplicated
No. is added
Stations No.1 to No.4 continues
cyclic transmission.
Station No.
duplicated