YOKOGAWA Vnet/IP - Connecting Network Switches by Ring Topology

  2.Vnet/IPNetworkConguration
2-14
TI 30A10A05-01E
Dec. 26, 2016-00
2.2.4 ConnectingnetworkswitchesbyRingTopology
n ConguringanetworkusingRingTopology
A ring network can be congured by connecting multiple L2SWs in a loop in a Vnet/IP domain.
A system conguration where Vnet/IP network is congured in a ring network is as shown below.
(1) Setting Ring protocol
Ring protocol has to be set to both Bus 1 and Bus 2 of the network switch for Vnet/IP to
make both of the Bus 1 and Bus 2 have ring conguration.
(2) Acknowledgment of occurrence of and recover from failures
The system has to be engineered to generate alarms when ring failures occur as well as
recover from failures. Specically, a signal from a FAULT output terminal of the network
switch assigned as the Ring manager (RM) has to be received by a digital input module of
CENTUM VP’s FCS, and its on/o󰀨 is to be notied to an HIS.
(3) Identifying failed point
Identication of the failed point in the ring network is done by the network management
system (PMS) in a computer independent from HIS or by manually.
When conguring a ring network, the network has to be segregated by VLAN for security
and prioritize tra󰀩cs.
F020208E.ai
HIS
FCS
FCSFCS
: Bus 1
: Bus 2
HIS
HIS/ENG
Computer for
ring management
L2SW
L2SW
L2SW
FAULT Signal
(2)
Acknowledgment of
occurrence of and
recovery from failure
Setting Ring protocol
Identifying the failed point
(3)
Figure RingNetworkStructure
Contact Yokogawa for more details about how to congure a network using Ring topology.