Yokogawa YFGW710 - Manual (Page 114)

<B2. System Maintenance>
B2-3
IM 01W01F01-01EN
Note 1: When a system alarm indicating an error with YFGW710 occurs, the process alarm is
displayed for the process data of all the devices connected to the YFGW710 in question
at the same time.
Note 2: Access YFGW710 with Field Wireless Control Tool to determine whether the error is a
YFGW710 error or a routing error.
Note 3: If the process alarm is occurring for the process data of all the devices connected to a
particular routing device, the error is considered to be an error of that routing device. (In
such a case, the system alarm is probably occurring for the routing device in question as
well as all the devices connected to that routing device at the same time)
In this case, replace the batteries.
If replacing the batteries does not recover the system, replace the routing device itself. If
replacing the routing device itself does not recover the system, the field wireless network
conditions in the vicinity of the device are likely to be unstable. Contact Yokogawa.
Note that devices connected to the routing device can be identified from the page of the
Network Topology tab of Field Wireless Management Tool.
Routing device
Routing device
FB0202.ai
Figure B2-2
Note 4: Check the data status of the process data using Field Wireless Management Tool.
When the data status is good, the problem lies in the control system. Refer to the user's
manual of the control system. There is the possibility that, for example, the control system
has detected an upper or lower limit error of the process data.
Note 5: Also check in PRM whether or not a device alarm indicating a device error is being dis-
played.
Note 6: There is the possibility that field wireless communication quality has deteriorated. Contact
Yokogawa.