Specifications

Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
CHAPTER
3–1
3
Connecting on a LAN
This chapter discusses connecting Niagara devices on the same enterprise LAN or
WAN using the following main topics:
• Niagara Considerations
• Connecting an Engineering PC
• Connecting a New JACE Controller
• Troubleshooting Connectivity to an Existing JACE Controller
• Using DHCP
Niagara Considerations
This section discusses typical system architectures and best practices when
engineering Niagara environments. Before reading further, if you are not already
familiar with networking and TCP/IP concepts, you may want to review Chapter 1,
“Understanding Networking and IP Addressing.” If you are familiar with these
concepts, you may want to review just the the “Niagara Considerations” section on
page 1-32.
System Architectures
Figure 3-1 and Figure 3-2 provide examples of typical Niagara job configurations
(system architectures) for a single site (with a LAN) and multi-site (two LANs
forming a WAN) environment.
Single site In the scenario presented in Figure 3-1, a customer has a single site with a LAN,
connecting to the Internet through a firewall. The firewall provides security, as well
as network address translation (NAT), which provides company devices with public
IP addresses so they can be accessed from the Internet.
The site has multiple JACE controllers controlling field devices. These JACEs have
private IP addresses, and therefore cannot be accessed by the BUI user located across
the Internet. However, they can be accessed by the BUI user located on the same
LAN.