Mitsubishi Electronics A1SJ71AT23BQ ユーザーズマニュアル
5
- 21
5.5 Self-diagnostic Test
5.5.3 Forward loop test/reverse loop test
5.5.3 Forward loop test/reverse loop test
5
PREPARATORY PROCEDURES BEFORE
OPERATION
(4) Judge of test result
The LED of the master station displays the test result.
(a) When normal
ERROR LED is turned ON and OFF repeatedly in a cycle of
"CRC OVER AB.IF TIME DATA UNDER CRC
"CRC OVER AB.IF TIME DATA UNDER CRC
".
(b) When failed
The LED which corresponds to the error is flashed, and the test is canceled.
1) When LEDs (TIME, DATA, and UNDER) are flashing
• Hardware failure
• Loopback due to cable disconnection or error of slave stations
• The master station (00) is set for more than one station.
• Short monitoring time
• Loopback due to cable disconnection or error of slave stations
• The master station (00) is set for more than one station.
• Short monitoring time
POINT
When a forward/reverse loop has an error, data link is switched to the one
performed by a reverse/forward loop.
When the forward/reverse loop returns normal, data link is performed by it.
However, LED display shows an error.
Perform a forward or reverse loop test after resetting the master station.
performed by a reverse/forward loop.
When the forward/reverse loop returns normal, data link is performed by it.
However, LED display shows an error.
Perform a forward or reverse loop test after resetting the master station.
Figure 5.27 When normal
Figure 5.28 When failed
A
1SJ71AP21
E
R
R
O
R
R
R
O
R
RUN
SD
RD
F.LOOP
CPU
CRC
OVER
AB.IF
TIME
DATA
UNDER
F.LOOP
R.LOOP
A
1SJ71AP21
RUN
SD
RD
F.LOOP
CPU
CRC
OVER
AB.IF
TIME
DATA
UNDER
F.LOOP
R.LOOP
E
R
R
O
R
R
R
O
R