Omron CJ Series Operation Manual page 233

Errors in Remote I/O Communications
The following indicator patterns show that an error related to the CompoNet Network has occurred.
Errors can basically be identified by the NS indicator flashing red and the seven-segment display show-
ing d*.
MS NS 7-seg-
indi- indi- ment Item
cator cator display
d9
↓
Communica-
--- yy
tions error
↓
Red
zzz
d0
↓
Address
--- yy duplication
↓
Red
error
zzz
Illegal con-
--- E5 figuration
Red
error
d5
↓
Verification
--- yy error (Slave
↓
Red
missing)
zzz
d6 Verification
↓
error (Unreg-
--- yy istered Slave
↓
Red Participat-
zzz ing)
Communica-
tions have
stopped due
--- A0
to a commu-
Red
nications
error.
Indicators
: Lit
: Flashing
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Error
Probable cause of
history
error
(hex)
A system disconnection
0374
was detected.
An address duplication
error was detected for a
Slave Unit attempting to
0376 participate. Or, a com-
munications error was
detected for a Slave
Unit.
It was detected that the
Slave Units and
Repeater Units request-
ing to participate in the
0378
network exceeded the
permitted number of
Repeater Unit seg-
ments (two).
It was detected that a
Slave Unit registered in
the Registration Table is
not participating within a
0370 fixed time after power is
turned ON to the Master
Unit. The monitoring
time is set using the CX-
Integrator.
Participation of an
0372 unregistered Slave Unit
was detected.
A communications error
was detected while com-
munications were set to
0375
be stopped when a com-
munications error
occurred.
Unit operation after error detection
System operations continue. Each
detected disconnection is registered in the
error history. Participation of the discon-
nected Slave Unit is awaited. When there
is no longer any cause of an error, normal
operation is restored. (The NS indicator
lights green.)
The duplication error is registered in the error
history. All system operations continue.
Subsequent Slave Unit participation is
prohibited from the point where it is
detected that the permitted number of
Repeater Unit segments has been
exceeded in the participation process-
ing. Other system operations continue.
The error is registered in the error history.
After normal status is restored, the Unit
recovers by being restarted.
The error is registered in the error history.
System operations all continue, and
remote I/O operations start. Participation
of the Slave Unit where the error
occurred continues to be monitored.
When Slave Unit participation is com-
pleted, normal status is restored. (The
NS indicator lights green.)
The error is registered in the error history.
All other system operations continue,
without the participation of the unregis-
tered Slave Unit. Recovery is attained by
restoring normal status and restarting the
Unit.
The error is registered in the error history.
System operations continue. Remote I/O
communications with the Slave Units
stop, and communications with the CPU
Unit continue. There is no automatic
recovery even after the cause of the error
is removed. The Unit must be restarted to
recover.
7 Troubleshooting
Countermeasures
Either of the following may be the
cause of the error.
1) Communications had to be continu-
ally retried for the applicable Slave
Unit due to noise, until the specified
number of retries was exceeded.
2) Responses to communications
from the Master Unit are not possi-
ble because of a malfunction, line
disconnection, or communications
power supply interruption at the
Slave Unit itself.
Inspect the Slave Unit where the dis-
connection was detected, and remove
the cause of the error. There is no
need to restart the Master Unit.
A Slave Unit or Repeater Unit in the
same network is set for the same
node. Use the following procedure:
1) Turn OFF the power to the Master
Unit and the Slave Unit.
2) Change the duplicate node number
to a new value.
3) Turn the power back ON to the
Master Unit and the Slave Unit.
If the error is still not cleared, it can be
a communications error. Check for
noise entering the network, discon-
nected cables, loose connectors, and
loose signal lines, and check the net-
work installation to see if all specifica-
tions are met.
The maximum number of Repeater
Unit segments is registered to two in
the Master Unit and cannot be
changed. This error thus indicates
that there are three or more Repeater
Unit segments. Correct the wiring and
restart the Master Unit.
If the error is not cleared, check the
Slave Unit that is not participating.
Check and correct the status of the
unregistered Slave Unit, and then
restart the Master Unit.
Check and eliminate the cause of the
error, and then restart the Master
Unit.
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