Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 22)

1–5 Network Layers
Publication 1770Ć6.5.16 - October 1996
DH+ Link
A DH+ link is similar to a DH link, but is optimally used for smaller
networks consisting of limited nodes (about 15 maximum). A DH+
link accepts 64 devices and can transmit data at 57.6, 115.2, or
230.4K bits. (PLC-5/250, SLC, and PLC processors support 57.6
and 115.2K bits; SLC 5/04 processors support 230.4K bits; PLC-5
processors are expected to support 230.4K bits early in 1997.)
This processor Connects to a DH+ link
PLCĆ2
through the PLCĆ2 Family Interface module
(cat. no. 1785ĆKA3)
PLCĆ3
through the I/O Scanner Communication Adapter module
(cat. nos. 1775ĆS5,ĆSR5)
PLCĆ5 directly
PLCĆ5/250
through the Resource Manager module
(cat. nos. 5130ĆKA, ĆRM1, ĆRM2)
SLC 5/04 ➀ directly
➀ You can configure the data rate for SLC 5/04 processors.
A DH+ link implements peer-to-peer communication with a
token-passing scheme to rotate link mastership among the nodes
connected to that link.
RSĆ232ĆC link
(50 cableĆft. max.)
DH link
PLCĆ5/250 processor
cat. no. 5130ĆRM1
PLCĆ2 processor
cat. no. 1785ĆKA3
(or any other PLCĆ2
processor)
1770ĆKF2
DH+ link
1785ĆKA
T60 industrial
workstation with
ControlView software
1785ĆKE
personal computer
PLCĆ3 processor
cat. no. 1775ĆS5
T53 programming
terminal with 1784ĆKT
installed
SC SC
SC
SC = station connector; 1770ĆSC
PLCĆ5 processor
SLC 5/04 processor
notebook computer
with 1784ĆPCMK
T71 with 1784ĆKTx