Rockwell
Automation
Hands-On
Seminar Series
1
NETWORKING WITH DH+
2
2
DH+ Protocol Overview
• Peer-to-Peer Communication
– Utilizes Tolken Passing
• 64 nodes maximum
• Remote Programming of SLC 500’S, PLC-2, PLC-3, and
PLC-5
• Direct Connections to 5/04,PLC-5, Panelview, and
Industrial Terminals
• 57.6, 115.2, OR 230Kbaud data rate
• Pub # 1770-6.5.16 DH/DH-485/DH+ Ref Manual
• Robust Industrial Network
3
3
5/04 and DH+
• Channel 1: 3 Pin Connector
SLC 5/04 CPU
RUN
– Actual DH+ Communication
– Beldon #9463 Cable
FLT
FORCE
DH+
BATT
RS232
RUN REM PROG
• Programming Terminal
– Programming and
Monitoring
• Channel 0: RS-232 Port
–
–
–
–
DF1 Full and Half Duplex
Master and Slave
ASCII
DH-485
Channel 1
Prog Term
Channel 0
4
4
Network Topologies
Daisy-Chain
– Each device has two sections of cable tied together
– Each end has termination (resistor/capacitor)
Examples
DH+
DH-485
Remote I/O
SLC
Beldon #9463 cable
SLC
SLC
SLC
5
5
Network Topologies
Trunk-Line / Drop-Line
– Trunk line very long - run through plant
– Drop lines very short
– Drops connected to trunk with Y-adapters
Examples
Data Highway (DH)
Devicenet
DH+ can be
Trunk Line
Drop Line
SLC
Drop Line
SLC
Drop Line
SLC
Drop Line
SLC
6
6
DH+ Communications
RSLogix 500 Software
AI 500 Software
6200/AI Software
DH+
57.6Kbaud: 10,000 feet
115.2Kbaud: 5,000 feet
230.4Kbaud: 2,500 feet
Other
Processors
SLC-5/04
PLC-5
PLC-2, PLC-3
PLC-5/250
7
7
DH+ to DH-485 Interface

Interface through a 1785-KA5
– Translate DH-485 <-> DH+
– Allows PLC5s and SLCs to communicate
SLC 5/04
RSLogix 500
Software
PLC-5
PLC-5
DH+
DH+
DH-485 Network #2
DH-485 Network #1
Link Coupler
Link Coupler
Link Coupler
Link Coupler
SLC 5/01
SLC 5/02
SLC 5/03
SLC 5/03
8
8
Ethernet Communications
Ethernet
Ethernet
PI Ethernet
Gateway
DH+
DH+
DH+
PLC-5
PLC-5 with
Built-in Ethernet
SLC-5/04
9
9