Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Bedienungsanleitung Seite 22

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Seitenansicht 21
1–5Network Layers
Publication
17706.5.16 - 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
PLC2
through the PLC2 Family Interface module
(cat. no. 1785KA3)
PLC3
through the I/O Scanner Communication Adapter module
(cat. nos. 1775S5,SR5)
PLC5 directly
PLC5/250
through the Resource Manager module
(cat. nos. 5130KA, RM1, RM2)
SLC 5/04
directly
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.
RS232C link
(50 cableft. max.)
DH link
PLC5/250 processor
cat. no. 5130RM1
PLC2 processor
cat. no. 1785KA3
(or any other PLC2
processor)
1770KF2
DH+ link
1785KA
T60 industrial
workstation with
ControlV
iew software
1785KE
personal computer
PLC3 processor
cat. no. 1775S5
T53 programming
terminal with 1784KT
installed
SCSC
SC
SC
= station connector; 1770SC
PLC5 processor
SLC 5/04 processor
notebook computer
with 1784PCMK
T71 with 1784KTx
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