Echelon Networking - Emerson E2 Einstein Manual

If an end device does not have termination jump-
ers, CPC offers a termination block that can be used
to terminate MODBUS network endpoints (CPC P/N
535-2711). Connect this block just before the end
device (Figure 6-3) and connect the shield to earth
ground, keeping the exposed shield wire length as
short as possible (3 inches ideal maximum length).
Figure 6-3 - MODBUS Termination Block (P/N 535-2711)
FROM LAST
DEVICE
AT END OF
DAISY-CHAIN
SHIELD
WIRE
(CONNECT
TO EARTH
GROUND)
Figure 6-4 - MODBUS Term Block End-of-Chain Install

6.2. Echelon Networking

Echelon devices are networks together into con-
figurations called segments. A segment is a group of
up to 64 Echelon devices that are connected together
on an unbroken series of wires.
The recommended way of constructing an Eche-
lon Network is called daisy-chaining. In the daisy-
chain network configuration, devices are arranged by
subnets, which consist of one E2 and all Echelon
devices associated with the E2.
8 • E2 Controller Wiring Practices
First, all devices in a subnet are connected in an
unbroken chain without branches or "star configura-
tions" (see Figure 6-5). Then, if more than one E2 is
present on-site, all chains are connected so that the
entire network forms a large unbroken chain, called a
daisy chain (see Figure 6-6). This allows for all
devices in the Echelon Network to be hard wired
together for trouble free communication.
RECOMMENDED
UNBROKEN
CHAIN
Figure 6-5 - Echelon Wiring - Subnets
TB
Figure 6-6 - Echelon Wiring, pt. 2
E2 E2
E2s
E226513131rev
026-1903 Rev 4 19-APR-2010
E226513125rev