NUCLEUS Installation and Operation Manual 31
Chapter 2: Operation
Troubleshooting
In unusual situations, one of the following two problems may occur.
Persistent “Offline Devices” Message
Occasionally, the message Offline Devices may appear on a control
panel. A temporary flood of traffic may delay device communications.
Also, if you have just rebooted a frame or reinstalled a module, the
re-synchronization of the module’s status could cause a short delay. In
most instances, this message disappears without intervention once there
is a reduction in excessive network traffic. However, if the problem
persists, you may need to discover and eliminate the reason for the
message.
Follow one or more of these procedures to eliminate the message:
• Navigate through the control panel menu to the frame level, and
then return to the module’s parameter list.
• Log out by pressing and holding the Shift button while pressing the
Panel Enable button. Log back on to the panel.
• If the affected module and its resource module are NEO products,
reinstall both modules.
• Locate the source of any frequently reported alarms (if you are
using the CCS software applications), and then either resolve the
problem or disable the alarms.
Excessive alarm traffic could cause communication interference
between control panels and devices.
• If you are not using CCS software applications, attempt to resolve
any system alarms by checking card-edge indicators, frame
indicators, and the control panel alarm log if you are not using CCS
software applications.
• Reboot the control panel to clear a possible internal error. To do
this, simultaneously press the Shift, Enter, and Del (delete) buttons
and hold them for three seconds.
• Ensure that the subnet mask address for the device(s) or for the
panel is correct. For more information, see “Subnet Mask” on
page 42.
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