Publication 1762-RM001C-EN-P
21-16 Communications Instructions
Remote Messages
The controller is also capable of remote or off-link messaging. Remote
messaging is the ability to exchange information with a device that is not
connected to the local network. This type of connection requires a device
on the local network to act as a bridge or gateway to the other network.
Remote Networks
DH-485 and DH+ Networks
The illustration below shows two networks, a DH-485 and a DH+
network. The SLC 5/04 processor at DH-485 node 17 is configured for
passthru operation. Devices that are capable of remote messaging and are
connected on either network can initiate read or write data exchanges
with devices on the other network, based on each device's capabilities. In
this example, node 12 on DH-485 is a MicroLogix 1500. The MicroLogix
1500 can respond to remote message requests from nodes 40 or 51 on the
DH+ network and it can initiate a message to any node on the DH+
network.
This functionality is also available on Ethernet by replacing the SLC 5/04
at DH-485 node 17 with an SLC 5/05 processor.
Figure 21.1 DH-485 and DH+ Networks
NOTE
The MicroLogix 1000 can respond to remote message
requests, but it cannot initiate them.
NOTE
The MicroLogix 1200 capabilities are the same as the
MicroLogix 1500 in this example.
A-B
PanelView
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
TERM
A
B
COM
SHLD
CHS GND
TX
TX PWR
TX
DC SOURCE
CABLE
EXTERNAL
AIC+ AIC+ AIC+
AIC+
DH-485 Network
SLC 5/04
PanelView 550
MicroLogix 1500MicroLogix 1000 MicroLogix 1200
SLC 5/04
AIC+
AIC+
SLC 5/04 PLC-5
DH+ Network
Node 17
Node 19
Node 51 Node 40
Node 12
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