Ethernet, IP Addresses and
Honeywell Automation
Systems
Background – Ethernet Connections Cat-5
• Though Ethernet now supports many media, the
most common one in use is Cat 5 (Category-5)
twisted-pair cable.
• Maximum distance between nodes is restricted to
100 meters.
• The maximum distance between any two nodes on
a segment cannot exceed 2500 meters
• The maximum number of nodes on a network is
1024, but actual experience has shown that when
the number of nodes on a network exceeds 200,
too much of the network’s bandwidth is wasted by
collisions.
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Background: Ethernet Connections
PC-to PC Connections
using Ethernet
require a crossover
cable
Or
Electrically powered
switch/hub/router
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Background – TCP/IP addressing
• Most PCs, Laptops and most
modern automation systems
include at least one
component with an Ethernet
connection.
• All Ethernet ports have a
unique addressed called the
MAC address, but it is
typically not used
• Common network
communication relies on
TCP/IP addressing.
(Transmission Control
Protocol / Internet Protocol)
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Background - (TCP)/IP Address
• IP addresses are typically expressed as 4 groups
of numbers separated by a “.”
• Each group is between 0 and 255
• Each decimal number represents an 8-bit binary
group
Example:
198.53.147.45
• 11000110 00110101 10010011 00101101
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IP Subnet Mask
• Each IP Address includes a subnet mask
• Subnet filters RESTRICT Ethernet connections Subnet
numbers act as a “MASK” or “Gate”
• Each subnet segment is a string of leading 1’s and 0s
• Each subnet segment may only equal one of 8 numbers:
255 = 11111111 (must match exactly)
254 = 11111110 (must match except last bit (2 allowed))
252 = 11111100 (must match except last 2 bits (4 allowed))
248 = 11111000 (must match except last 3 bits (8 allowed))
240 = 11110000 (must match except last 4 bits (16 allowed))
224 = 11100000 (must match except last 5 bits (32 allowed))
192 = 11000000 (must match except last 6 bits (64 allowed))
128 = 10000000 (must match except last 7 bits(128 allowed)
0 = 00000000 (passes through everything! (256 allowed))
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Subnet Mask Filtering Example 1:
065.070.003.073 (IP)
255.255.255.0 (255 blocks everything that does NOT match)
That’s equal to:
01000001.01000110.00000011.01001001 (IP)
11111111.11111111.11111111.00000000 (SUBNET)
Only allows IP addresses :
0100001.01000110.00000011.00000000 up to
0100001.01000110.00000011.11111111
So this computer may connect to any other with an IP
address from 065.070.003.001 up to 065.070.003.255
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Subnet Mask Filtering Example 2:
065.070.003.073 (IP)
255.255.255.248 (block all but 8 computer addresses)
That’s equal to:
01000001.01000110.00000011.01001001 (IP)
11111111.11111111.11111111.11111000 (SUBNET)
Only allows:
0100001.01000110.00000011.01001000 up to
0100001.01000110.00000011.01001111
This computer will only connect with IP addresses
from 065.070.003.072 up to 065.070.003.079
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Connecting a Server to the Internet
• Server is part of
a LAN
• LAN has a
switch/hub
• LAN has a
192.168.1.201
router/gateway
for connection to
the Internet
• Account has
DSL Router,
fixed single
Gateway &
IP address
DNS Address
• Router uses
MAP function
MAP setup
67.231.141.208
192.168.1.101
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192.168.1.101
192.168.1.202
Fixed Server
IP address
192.168.1.1
Fixed
EXPOSED
Internet IP
67.231.141.208
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Assigning Addresses – Static and Dynamic
How are IP address assigned to the node?
• There are two basic methods; manual and automatic
• Automatic IP address are generated from a DHCP
server or router somewhere else on the network
• When an IP address is assigned manually, it is
referred to as a static IP address. Each time the
node is connected to the network, it will use the IP
address that was assigned.
• Windows users assign static IP addresses
- Start
- Settings
- network connections
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Changing a Static IP Address with Windows
1. Open Network
Connections
2. Open Local Area
Connection
5. Select Use the
following IP address
4. Select Internet
Protocol (TCP/IP)
3. Select Properties
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Direct Connections with Static IP addresses
1. Manually Set IP
Address on PC
similar to
controller’s IP
address (within
allowed subnet
range)
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Identifying an IP address on a PC:
Start > Settings > Network Connections
Select Local Area Connection
View the Support Tab
(assigned by DHCP
In this example)
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Identifying IP address on JACE
• See installation
Instructions
- Remove Cover
- Set Mode Jumper for
Serial Shell
- Use Serial NULL
modem cable on
COM-1
- Use HyperTerminal
software for
connection
 115,200 8-N-1
- On boot up will
display Ethernet port
address
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Identifying IP address on WEBs 400/500
• See installation
Instructions
- Set Mode Jumper for
Serial Shell
- Use Tridium adapter
cable for COM-1
- Use HyperTerminal
software for
connection
 57,600 8-N-1
- On boot up will
display Ethernet port
address
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PINGing a computer
• Utility program built into windows
• Verifies proper Ethernet IP to Ethernet IP
communication
• Select Start > Run > type “command” to open window
• In the command window type “ping xxx.xxx.xxx.xxx”
where xxx is the IP address to verify communication to
• Type “exit” to close command box
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WEBs Connections
• Questions?
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