OPTO 22 SNAP PAC R SERIES, Руководство пользователя

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NETWORKING
SNAP PAC R-Series Controller User’s Guide 28
Ethernet Link Redundancy
The following diagram shows two SNAP PAC R-series controllers functioning as I/O unit brains connected to
two separate Ethernet networks. This configuration addresses the concern that an Ethernet network may fail
or need maintenance, leaving the PC running OptoOPCServer, the PC running PAC Display, the controller, and
the I/O units unable to communicate. The network shown in this diagram requires PAC Control Professional,
PAC Display Professional, and OptoDataLink.
In this configuration, if one network goes down, devices can still communicate because the SNAP PAC S-series
controller and the SNAP PAC R-series controllers both have two network interfaces, and each PC in this system
has two network interface cards.
NOTE: If you need controller redundancy (two controllers running concurrently, with one able to take over if the other
fails), use SNAP PAC S-series standalone controllers with the PAC Redundancy Option Kit and PAC Control
Professional. For more information, see the Opto 22 website.
PC with two NICs running PAC
Display Professional
PC with two NICs running
OptoOPCServer
I/O units are all connected by the controller. Each
I/O unit is connected to its own group of sensors
and actuators, but all are connected to the same
two networks.
SNAP PAC S-series
controller controls all
I/O units.
SNAP PAC R-series
controller
Sensors & actuators,
location #2
Sensors & actuators,
location #1
Opto 22 Redundant Network
Ethernet switch,
network #2 Ethernet switch,
network #1
SNAP PAC R-series
controller