Emerson E2 Wire Restrictions, Installing Echelon Devices, Powering Echelon Devices

8.4.1Using 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 supplies 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 block.

Figure 8-4- Placement and Wiring of the Termination Block

8.5Wire 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 boost 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 Router and Repeater Installation Guide (P/N 026-1605), for information about router and repeater placement.

8.6Installing 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.

8.6.1Powering 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 8-3lists each transformer’s part number and rating.

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

Table 8-3- Class 2 Transformers for Echelon Devices

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:

Wire Restrictions Echelon Network and Hardware Setup • 8-3