Yokogawa YFGW410 - Manual (Page 189)

F2-3
IM 01W02D01-01EN
If the “RDY” indicator LED lights red to indicate that an error occurred when the YFGW410 was
started by turning the power on, it is assumed that an inconsistency is detected in the device set-
ting or version.
If the “RDY” indicator LED blinks red to indicate that an error occurred at start-up of the
YFGW410, it is assumed that the cable for redundancy is not connected normally. Check it, and
restart the YFGW410 for recovery.
If the “RDY” indicator LED lights green or the “SYN” indicator LED lights red to indicate a syn-
chronization failure, restart the YFGW410. If the same phenomenon recurs, it is assumed that a
device failure occurs.
If an error is detected in the standby YFGW410 while the redundant system is active, the “RDY”
indicator LED lights red and the “SYN” indicator LED lights green to indicate an error in the
standby YFGW410. If an error is detected in the active YFGW410, the control is transferred to the
standby side, and the database is synchronized. After the synchronization has been completed,
three indicator LEDs light green in a new active side to indicate the normal state. In the standby
side with a persisting failure, the “RDY” indicator LED lights red and the “SYN” indicator LED
lights green to indicate the abnormal state of the standby side YFGW410. After this, if an error is
recovered, the “RDY” indicator LED lights green and the standby side returns to the normal state.
If an error occurs in the active side before an error is recovered in the standby side, the “RDY”
indicator LED lights red and the “SYN” and “ACTIVE” indicator LEDs light green to indicate an
error in the active side.
When the “RDY” indicator LED lights red to indicate a device error, check the cables and hubs
connected to the field network port for the host system. If an error is detected, recover it. If no
error is detected in wiring relation, an error is indicated in gateway status information described
in Section F2.1 Status Information, or an error is indicated in device information on the Monitor,
it is assumed that a failure occurs in the YFGW410. For details on how to replace a YFGW410
device, see Section E2.3 Field Wireless Management Station (YFGW410).