Automationdirect.com HX-ECOM Series - H4 Series ECOM; ECOM Network Layouts

Ethernet Communications Modules, 3rd Edition, Rev. D
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Chapter 2: Setup and Installation
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H4 Series ECOM
Before installing the ECOM module, verify power to the PLC is turned off. To insert the
ECOM module in a DL405 base, place the bottom tab of the module into Module Installation
the notch at the bottom of the base. Pivot the module toward the base as shown below. Ensure
that each module is tightly seated and secured with the captive screw at the top of the module.
ECOM 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 for PLCs software can also initiate communications
with any ECOM that is on the same network, but a PLC cannot initiate communication with
the PC. A PLC cannot literally broadcast to all other PLCs at the same time, but a PLC can
sequence through communication connections with other PLCs 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 hub or
repeater connects multiple network capable devices into a star topology. Multiple hubs or
repeaters are used to modify the star topology so that it becomes a star-bus-star topology. See
the figures below and on the next page.
Point-to-Point
Disconnect power before installing module!
DL405 Base
Point-to -Point
Point-to-Point