Mitsubishi Electric MELSEC A Series User Manual page 63

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(17) Mode select switch
By switching mode, the following functions are available:
Setting
Number
0
Online
1
Online
2
Online
Forward loop
3
test mode
Reverse loop
4
test mode
Station-to-sta
tion test
5
mode
(master
station)
Station-to-sta
tion test
6
mode (slave
station)
Self-loopback
7
test mode
8 to F
Name
Automatic return is set during normal
operation.
Automatic return is not set during normal
operation.
The host station is disconnected.
Used to perform a line check on the optical
fiber cables or coaxial cables in the forward
loop (for normal data link) throughout the
entire data link system.
Used to perform a line check on the optical
fiber cables or coaxial cables in the reverse
loop (for loopback when an error occurs)
throughout the entire data link system.
Used to check the line between two stations.
The line is checked with the station with the
smaller station number set as the master
station and the other station set as a slave
station.
Used to check the hardware, including the
send/receive circuits of the communications
system, of one data link module in isolation.
Unusable
Description
50

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