SNAP PAC Redundancy Option User’s Guide
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2: 2: Connecting the HardwareChapter 2
2: Connecting the Hardware
This chapter describes how to connect the serial, Ethernet, and power cables for the components
used in a redundant system, including the SNAP PAC S-series controllers, the SNAP-PAC-SRA arbiter,
and the SNAP-RPSW redundant power switch. It also introduces a few basic configuration scenarios.
In This Chapter
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Connecting the PAC S-series Controllers
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What You Will Need
•
A PC running PAC Control Professional 9.0 or higher
•
A crossover cable to connect the two controllers.
•
10BASE-T or 100BASE-TX Ethernet network
•
The SNAP PAC Redundancy Option Kit, part number SNAP-PAC-ROK, which includes a
SNAP-PAC-SRA arbiter and a SNAP-RPSW redundant power switch
•
Three SNAP-PS24 power supplies
•
A functioning Ethernet-based SNAP PAC control system that includes:
–
Two SNAP PAC S-series controllers that are exactly the same model, such as two
SNAP-PAC-S2s or two SNAP-PAC-S2-Ws, with firmware R9.0a or higher and loader R6.0a or
higher
–
One or more Opto 22 SNAP PAC Ethernet brain-based I/O units on the same Ethernet
network as the controllers
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PAC Control strategy developed for use on the system’s two redundant controllers. See
for information on how to develop a strategy for controller
redundancy.
