Programmer (HHP) User guide

Appendix D
Understanding the Communication Protocols
D–17
MicroLogix Remote Packet Support
Series D MicroLogix discrete controllers and all MicroLogix analog
controllers can respond to communication packets (or commands) that do not
originate on the local DH-485 network. This is useful in installations where
communication is needed between the DH-485 and DH+ networks.
The example below shows how to send messages from a PLC device or a PC
on the DH+ network to a MicroLogix 1000 controller on the DH-485
network. This method uses an SLC 5/04 processor bridge connection.
When using this method:
• PLC-5 devices can send read and write commands to MicroLogix
controllers.
• MicroLogix 1000 controllers can respond to MSG instructions received.
The MicroLogix controllers cannot initiate MSG instructions to devices
on the DH+ network.
• PC can send read and write commands to MicroLogix controllers.
• PC can do remote programming of MicroLogix controllers.
DH+ Network
PLC-5
SLC 5/04
Modular I/O Controller
DH-485 Network
MicroLogix 1000
Programmable
Controller
MicroLogix 1000
Programmable
Controller
MicroLogix 1000
Programmable
Controller
PLC-5
SLC 5/03 System