CHAPTER 1: OVERVIEW
SNAP PAC S-Series User’s Guide
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Segmented Wired Networks
The following diagram shows Opto 22 I/O units connected together over an Ethernet network and
controlled by a SNAP PAC S-series controller running a PAC Control strategy. The controller is also
connected to a larger, separate enterprise Ethernet network to provide data to two PCs running
PAC Display HMI software and OptoOPCServer. Sitting between the two networks, the SNAP PAC
S-series controller segments enterprise traffic from the control network.
For this system, PAC Display must be configured to access the I/O through the controller rather than
directly from the I/O units, since they are on a separate network.
PC running
OptoOPCServer
and OptoDataLink
PC running PAC
Display Professional
Ethernet switch,
network #1
Ethernet switch,
network #2
Enterprise Network
Control Network
SNAP PAC S-series controller communicates with host
computers through one network interface and controls
I/O with other devices through the other interface.
I/O units are controlled by the
controller on an isolated segment.
Sensors and actuators,
location #1
Sensors and actuators,
location #2
