Filter
Top Products
Wire Restrictions Echelon Network and Hardware Setup • 8-3
8.4.1 Using a Termination Block
(P/N 535-2715) to Terminate a Daisy
Chain
Some Echelon Network devices, notably TD3s, have
no on-board means of terminating. For some other
devices, it is inconvenient to use the jumpers supplied for
termination (the CC-100/CS-100 case controllers, for
example, require the enclosure to be removed to set the
jumper).
To remedy these problems, Emerson Retail Solutions
suppl
ies termination blocks that can be wired to the end of
an Echelon cable segment. This termination block uses the
same three-pin connector as all other Echelon devices.
Wire the two signal wires to the outside terminals, and
connect the shield to the middle terminal (see Figure 8-4).
NOTE: The recommended termination proce-
dure for all Echelon devices is the termination
blo
ck.
Figure 8-4
- Placement and Wiring of the Termination Block
8.5 Wire Restrictions
Maximum Total Segment Length
The total amount of wire used to connect all E2s and
associated controllers in a single segment (not including
devices on the other side of routers) cannot be longer than
4592 feet (1400 meters). If the total length of cable used is
longer than 4592 feet, a repeater or router will be required.
Routers act as
communication gateways that reduce
the amount of network traffic. They are used when net-
works exceed their 63-node limit. Adding
a router allows
you to add another daisy-chain segment of 4592 feet with
a maximum of 63 more nodes.
Repeaters bo
ost signal strength and are only used in
instances where a segment of 63 nodes or less uses more
than 4592 feet of Echelon cable.
Refer to the Rout
er and Repeater Installation Guide
(P/N 026-1605), for information about router and repeater
placement.
8.6 Installing Echelon
Devices
The E2 control system has several types of peripheral
control boards that communicate using the Echelon Net-
work: the 16AIe analog
input board, the 8ROe relay out-
put board, the CC-100/CS-100 series of case control and
case
circuit control boards, and the ESR8 board.
8.6.1 Powering Echelon Devices
CAUTION: Do not power Echelon devices
with the same 56VA and 80VA transformers
used
to power the I/O Network. Echelon
devices require Class 2 power to operate, which is not
supplied by the I/O board transformers.
All Echelon devices require 24VAC Class 2 power.
Emerson
Retail Solutions specs several sizes of transform-
ers to accommodate the full range of Emerson Retail Solu-
tions’ Echelon-compatible products. Table 8-3 lists each
transformer’s part number and rating.
Table 8-3
- Class 2 Transformers for Echelon Devices
Xformer P/N VA Rating Input Voltage
640-0039 10 VA 110 VAC
640-0041 50 VA 110 VAC
640-0042 50 VA 220 VAC
640-0050 75 VA 110 VAC
640-0045 75 VA 220 VAC
To select a power transformer for one or more Echelon
devices:
1. Determine what the total VA is for the boards
and
controllers that will be powered by the
transformer (see Table 8-4).
Example: Two TD3 boards (4 VA each), and
one E2 (40
VA) board are to be powered by
one transformer. The total VA is: