Automation Direct Do-more H2 PLC Series, Руководство пользователя по оборудованию

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Do-more H2 Series PLC User Manual, 1st Edition, Rev. F - H2-DM-M
7–18
Chapter 7: Specifications - Specialty Modules
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H2-ECOM100 Network Layouts
The ECOM Ethernet network is a peer-to-peer network. Using Read (RX) or Write (WX)
instructions, any PLC on the network can initiate communications with any other PLC on the
network. A PC running our KEPDirect software can also initiate communications with any
ECOM that is on the same network, but a PLC cannot initiate communication with the PC.
An ECOM can sequence through communication connections with each PLC on the network,
one at a time.
The ECOM products inherently support two network layouts:
point-to-point and star. The point-to-point layout can be
used to link together two PLCs or a PC and a PLC. A switch
connects multiple networkable devices into a star topology.
Multiple switches are used to modify the star topology so that
it becomes a star-bus-star topology. See the figures below
Switches can connect together to make it possible to connect more devices to the network or
to extend the range of the network.
Point-to-Point
RS-232
SERIAL
USB
PGM
PORT
RUN
TERM
STOP
1
0
/
1
0
0
E
T
H
E
R
N
E
T
H2-DM1E