DL205 User Manual, 4th Edition, Rev. D
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Chapter 4: System Design and Configuration
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D2–EM Local Expansion Module
The D2–EM expansion unit is attached to the right side of each base in the expansion system,
including the local CPU base. (All bases in the local expansion system must be the new
(–1) bases). The D2–EMs on each end of the expansion system should have the TERM
(termination) switch placed in the ON position. The expansion units between the endmost
bases should have the TERM switch placed in the OFF position. The CPU base can be located
at any base position in the expansion system. The bases are connected in a daisy–chain fashion
using the D2–EXCBL–1 (category 5 straight–through cable with RJ45 connectors). Either of
the RJ45 ports (labelled A and B) can be used to connect one expansion base to another.
The status indicator LEDs on the D2–EM front panels have specific functions which can help
in programming and troubleshooting.
WARNING: Connect/disconnect the expansion cables with the PLC power turned OFF in order for the
ACTIVE indicator to function normally.
D2–EXCBL–1 Local Expansion Cable
The category 5 straight–through D2–EXCBL–1 (1m) is used to connect the D2–EM expansion
modules together. If longer cable lengths are required, we recommend that you purchase a
commercially manufactured cable with RJ45 connectors already attached. The maximum total
expansion system cable length is 30m (98ft). Do not use Ethernet hubs to connect the local
expansion network together.
NOTE: Commercially available Patch (Straight–through) Category 5, UTP cables will work in place of the
D2–EXCBL–1. The D2–EM modules only use the wires connected to pins 3 and 6 as shown above.
D2–EM Indicator Status Meaning
ACTIVE (Green)
ON D2–EM is communicating with other D2–EM
OFF D2–EM is not communicating with other D2–EM
D2–EXCBL–1 Cable
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34 562187
8-pin RJ45 Connector
(8P8C)
RJ45 RJ45
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GRN
GRN/WHT
GRN
GRN/WHT
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