Yokogawa YFGW410 - Manual (Page 197)

<G2. Field Wireless Network>
G2-4
IM 01W02D01-01EN
G2.3.5 Number of Hops
The field wireless system constituted from YFGW410 supports a wireless communication with up
to 4 hops. The number of hops is defined depending on the number of field wireless devices in a
route that reaches YFGW510 as shown below. Up to 4 hops are supported, taking into account
the worst case. For a route to YFGW510, including redundant routes, a field wireless device with
1 hop is defined as a field wireless device directly connected to the backbone router. The field
wireless device directly connected to the backbone router supports the 0.5 seconds update cycle
at the earliest. Other field wireless devices support the 10 seconds update cycle at the earliest.
B
IO R
R
B
R IO
IO
Hop 1
Hop 2
Hop 3
Hop 4
FG0202.ai
G2.3.6 Communication between Devices
The field wireless system constituted from YFGW410 does not support field wireless device to
field wireless device communication field wireless devices. It supports only a communication via
YFGW410.
G2.4 Duocast (ISA100.11a Standard)
The field wireless system constituted from YFGW410 supports Duocast. Duocast is a function
that makes a YFGW510 redundant by sending packets from the field wireless device directly
connected to the backbone router to 2 YFGW510. The Duocast function is enabled by configur-
ing the same Duocast ID to 2 YFGW510. The field wireless device enhances the reliability of
wireless communications by simultaneously sending data to 2 YFGW510.