Mitsubishi Electronics A1SJ71AT23BQ ユーザーズマニュアル
5
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5.5 Self-diagnostic Test
5.5.1 Self-loopback 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.
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:
(
front of the link module as follows:
(
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
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
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
IN
OUT
Coaxial cable
Front
Data flow of
forward loop
Data flow of
reverse loop
forward loop
Data flow of
reverse loop
Local station
No.1
Station No.01