Yokogawa YFGW410 - Manual (Page 179)

<E1. Routine Maintenance>
E1-2
IM 01W02D01-01EN
E1.2 Handling a Device in the Abnormal Status
Check the status of a device by an abnormal status notification from a host application, and give
an emergency treatment for a device of which the status is abnormal.
While referring to the detailed device information displayed on the Monitor, judge whether there is
a problem in the communication path between devices or the power supply, or the device itself or
whether the sensor is defective. Then, take the appropriate action.
For details on how to handle an abnormal device, see the user’s manual of the relevant device.
Methods it handle problems on the YFGW410 are explained in this user’s manual.
E1.3 Handling a Device in the Warning Status
If there is a device that is judged to be subject to the warning status by an abnormal status noti-
fication received from a host application or by a daily monitor check, a communication error may
occur if the situation deteriorates even if the process value or a status communication is contin-
ued.
The Monitor is supervising the wireless communication quality (PER, RSSI) of the field wireless
device, remaining battery power level of the battery-powered device, and YFGW510 wireless
LAN communication quality (RSSI) of the wireless LAN option specification. If these conditions
become worse than the threshold specified by the Configurator, the target device is judged to be
subject to the warning status, and a warning message appears on the Monitor.
If a warning message appears due to the low remaining battery power level of the field wireless
device, immediately replace the battery pack regardless of the displayed number of days. For
details on the replacement procedure, see the user’s manual of the relevant device.
If a warning message appears due to a problem related to the wireless communication quality,
check if a wireless communication error occurs on the communication path. Furthermore, check
if a new structure or construction equipments is found on the route or around the device, and if
the use of a new wireless communication is started in the same frequency band such as wireless
LAN in a nearby area. For a short period of time, monitor the device for which a warning message
is displayed due to a problem related to the communication quality. If there are no symptoms to
return to the normal status by itself, adjust the device arrangement, especially the antenna instal-
lation position, or take into account the addition of a device with the router function. If a wireless
device operated by the IO function is found on the communication path, change it to the IO +
Router function, or add a new wireless device with the router function to an appropriate position
to recover the communication path to the normal status.
If a warning message appears due to a problem related to the quality of a wireless LAN com-
munication of YFGW510, to recover the status, eliminate the cause of an obstacle on the com-
munication path, or appropriately change the installation position, considering a field wireless
communication.
For details on how to check the threshold specified by the Configurator, see Sub-section D3.2.6
Alert Settings. For details on how to check the status of the wireless system on the Monitor and
operate the Monitor, see Section D4.2 Wireless Network Management.