Publication 1785-UM012D-EN-P - July 2005
11-30 Communicating with Devices on an Ethernet Network
Keep in mind these considerations:
• RSLogix programming software on ControlNet and DH+ links cannot
see the controllers on an Ethernet link.
• The RSLinx DDE server on a ControlNet link cannot poll data from
the controllers on an Ethernet link.
• The RSLinx DDE server on a ControlNet link cannot accept
unsolicited data from controllers on an Ethernet link.
• Applications that register themselves as nodes on the RSLinx “Virtual
Link” in workstations on ControlNet cannot accept unsolicited packets
from controllers on Ethernet.
• Applications that register themselves as nodes on the RSLinx “Virtual
Link” in workstations on an Ethernet link cannot accept unsolicited
packets from the controllers on an Ethernet link.
Multihop Examples
The following examples use this system configuration:
The following table shows the multihop path you enter to communicate over
these scenarios.
POWER
PROGRUN
REM
RUN I/O
RS232
BAT
OK
Logix5550
DIAGNOSTIC
DC OUTPUT
FLT
ST
FLT
ST
O
K
0 1 2345 67
0 1 234567
8910 11 12 13 14 15
8 9101112131415
DC INPUT
ST
ST
O
K
0 1 2345 67
8910 11 12 13 14 15
DC INPUT
B
A
OK
A#24
DC INPUT
A#24
DC INPUT
A#24
DC INPUT
B
A
OK
A#24
POWER
PROGRUN
REM
RUN I/O
RS232
BAT
OK
Logix5550
DIAGNOSTIC
DC OUTPUT
FLT
ST
FLT
ST
O
K
0 1 2345 67
0 1 234567
8910 11 12 13 14 15
8 9101112131415
DC INPUT
ST
ST
O
K
0 1 2345 67
8910 11 12 13 14 15
DC INPUT
B
A
OK
A#24
DC INPUT
A#24
DC INPUT
A#24
DC INPUT
B
A
OK
A#24
originating
PLC-5 controller with
Ethernet interface module
Ethernet link
ControlNet link
DH+ link (link 30)
DH+ link
(link 12)
ControlNet link
ControlNet
PLC-5
controller
(node 1)
PLC-5 controller
(DH+ station 76)
ControlLogix chassis 1
slot 0 Logix5550 controller
slot 1 1756-ENET module
slot 2 1756-CNB module
slot 3 1756-DHRIO module
ControlLogix chassis 2
slot 0 Logix5550 controller
slot 1 1756-DHRIO module
slot 3 1756-CNB module (node 4)
slot 6 1756-CNB module
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