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5.5 Self-diagnostic Test
5.5.1 Self-loopback test
5
PREPARATORY PROCEDURES BEFORE
OPERATION
5.5.1 Self-loopback test
The self-loopback test checks the hardware including transmission circuit in a single local
module.
The hardware is judged by whether the data sent from the send side can be received by
the receive side in a given time.
(1) System configuration
(a) MELSECNET(A1SJ71AP23Q)
An optical fiber cable connects the OUT and IN of the local module.
(b) MELSECNET(A1SJ71AR23Q)
A coaxial cable connects the OUT and IN of the local module.
(c) MELSECNET/B(A1SJ71AT23BQ)
There is no need to connect a cable or terminating register to the local module.
(2) Switch setting
Set the RUN/STOP switch of the CPU module to STOP, and set the DIP switch on the
front of the link module as follows:
( Section 5.3 Part Names and Settings)
Figure 5.13 MELSECNET(A1SJ71AP23Q)
Figure 5.14 MELSECNET(A1SJ71AR23Q)
Table 5.5 Switch setting
Item No. (Set value) Description
Local station No.1
Station No. setting
switch
01 Station No.1
Mode setting switch 7 Self-loopback test
Front
OUT IN
Data flow of
forward loop
Data flow of
reverse loop
Optical fiber cable
Local station
No.1
Station
No.01
R-RD
F-SD
F-RD
R-SD
INOUT
Coaxial cable
Front
Data flow of
forward loop
Data flow of
reverse loop
Local station
No.1
Station No.01