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• If the bus cable between the slave station 05
03
02
01
(8)
(8)
(8)
State of an individual communication flag
D
7
6
5
4
3
2
OFF
Unstable
Remove the connector on point
A, and turn ON the termination
resistance of the master station.
Connect the A connector, and
then remove the connector on
point B.
Remove the connector on point
C and make sure the B
connector is not connected.
Turn ON the termination
resistance of the slave module
05
.
(8)
Connect the C connector and
make sure the B connector is
not connected, and remove the
connector at the next point to
the point D.
Turn OFF the termination
resistance of the slave station
05
, and turn ON the
(8)
termination resistance of the
end station 06
.
(8)
Cause
Disconnection in the bus cable and the
branch cable between the station 05
06
, or contact failure of the connectors
(8)
Error on the slave station 06
and 06
(8)
Master
04
05
(8)
(8)
station
B
A
C
Disconnection
D
1
0
OFF
As the communication possible stations
03
, 02
, 01
, and 04
(8)
(8)
(8)
state of communication monitoring flag is
as follows.
D
7
6
5
4
OFF
As the one side of the termination
resistance is lost, all of the
communication possible stations 05
06
, and 07
are abnormal, and the
(8)
(8)
station 05
is unstable.
(8)
D
7
6
5
4
3
OFF
Unstable
OFF
As the communication possible station
05
is normal, abnormal points exists
(8)
ahead of the point C.
D
7
6
5
4
3
OFF
ON
OFF
As the one side of the termination
resistance is lost, the station 05
06
become communication possible
(8)
stations, but the station 05
and the station 06
the abnormal states occur between the
point C and the point D.
D
7
6
5
4
3
OFF
Unstable
OFF
Remove both the bus cable and
the branch cable connectors. After
and
(8)
that, shorten one of these
connectors and check conductivity
using a tester.
Exchange the slave module.
(8)
9
65
·
is disconnected in the following system.
(8)
06
07
(8)
(8)
D
are normal, the
(8)
D
3
2
1
0
ON
,
(8)
D
2
1
0
ON
D
2
1
0
ON
and
(8)
is unstable
(8)
is turned to OFF, so
(8)
D
2
1
0
ON
Countermeasure
9
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