OPTO 22 SNAP PAC R SERIES, Руководство пользователя

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CHAPTER 3: SYSTEM INFORMATION
SNAP PAC R-Series Controller User’s Guide 25
Network Architecture Diagrams
Because SNAP PAC R-series controllers have two Ethernet interfaces and an RS-232 serial interface—and
Wired+Wireless PACs add a wireless LAN interface—these controllers are suitable for use in a variety of system
layouts and architectures. For example, the independent Ethernet interfaces let you configure a network for
link redundancy or segmented networking. As described in the previous section, the PPP serial interface
provides a dial-up modem link for remotely located control systems. The serial interface can also be used to
connect a serial device such as a barcode scanner.
Basic Control Network
The following diagram shows a SNAP PAC R-series controller that uses one network interface to communicate
with host computers and control I/O. The controller controls I/O on its own rack and on other SNAP PAC I/O
units.
.
SNAP PAC R-series
Additional I/O units are
controlled by the R-series
controller on the network.
Basic Control Network
PC running
PAC Display Basic
Ethernet switch
Field devices
location #1 Field devices
location #2