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9 Troubleshooting and Maintenance
9-34
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
9-3-4
Communications Error Operation Settings
Error
Probable cause
Communications are stopped even though
there is no communications error.
When pin 3 on the DIP switch is ON, communications will be stopped if a
communications error, transmission timeout, or network power supply error
occurs.
While communications are stopped, the 7-segment indicators will alter-
nately display error code A0 and the error code of the communications error
that caused the stoppage.
In the case of a network power supply error or a transmission timeout, the
error code will disappear and the indicator will show just the communica-
tions stoppage code (A0) after the correction.
After stopping is performed because of the
communications stop setting for when a
communications error occurs, stopping is
not released even after a "stop release"
operation.
•
When communications can't be restarted with slaves that were communi-
cating normally before the stoppage, stop the communications again.
Check that the slave has started up and perform the "clear communica-
tions error stoppage" operation.
•
It may be necessary to perform the operation twice if the network con-
tains another company's slave that take a long time to join the network.
9-3-5
Scan List Problems
Error
Probable cause
A scan list couldn't be created by the "cre-
ate scan list" operation.
A scan list couldn't be cleared by the "clear
scan list" operation.
Neither the scan list clear nor create scan list operations can be performed
until
*_Mstr1IOCommSta
(I/O Data Communications) changes to TRUE in
the Master Status Area after the power is turned ON and the I/O Data Com-
munications Status will change to TRUE again after the scan list clear oper-
ation is executed.
Make sure that the I/O Data Communications Status changes to TRUE
before attempting to execute the create scan list or scan list clear opera-
tions.
The "create scan list" or "clear scan list"
operation was executed, but the master's 7-
segment indicators still display "- -".
(The "- -" display usually lasts for 1 second
after the "create scan list" operation or 0.1
seconds after the "clear scan list" opera-
tion.)
Restart the DeviceNet Unit, execute the clear scan list operation, and then
the create scan list operation if necessary.
Replace the DeviceNet Unit if this doesn't correct the problem.
Содержание CJ1W-DRM21
Страница 12: ...Manual Structure 10 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 42: ...Revision History 40 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 214: ...6 Message Communications 6 26 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 ...
Страница 345: ...Index 1 CJ series DeviceNet Units Operation Manual for NJ series CPU Unit W497 I Index ...
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