CHAPTER 3: SYSTEM INFORMATION
SNAP PAC R-Series Controller User’s Guide
27
Network Segmenting: Ethernet Connections to Host and I/O Units
The following diagram shows two Opto 22 I/O units connected together over an Ethernet network and
controlled by a SNAP PAC R-series controller running a PAC Control strategy. The network shown in this
diagram requires PAC Project Professional.
The controller is also connected to a larger, separate enterprise Ethernet network to provide data to PCs
running Opto 22’s PAC Display HMI software, OptoOPCServer, and OptoDataLink. Sitting between the two
networks, the SNAP PAC R-series controller segments enterprise traffic from the control network.
PC running
OptoOPCServer and
OptoDataLink
PC running PAC
Display
Professional
Ethernet switch,
network #1
Additional I/O units are controlled by
the R- series controller on an isolated
network.
Ethernet switch
SNAP PAC R-series
SNAP PAC R-series controller communicates with host computers through one network interface and
controls I/O both directly on the rack and through the other Ethernet interface.
Control Network
Field devices
location #1
Field devices
location #2
Enterprise Network
