Communications Error Operation Settings; Scan List Problems - Omron CJ1W-DRM21 Operation Manual

9 Troubleshooting and Maintenance
9-3-4

Communications Error Operation Settings

Error
Communications are stopped even though
there is no communications error.
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.
9-3-5

Scan List Problems

Error
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.
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.)
9-34
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.
• 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.
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.
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.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Probable cause
Probable cause