Pilot Channel Communications; Description; Fiber: Led And Eled Transmitters - GE L30 Instruction Manual

3 HARDWARE

3.3PILOT CHANNEL COMMUNICATIONS

A special inter-relay communications module is available for the L30. This module is plugged into slot "W" in horizontally
mounted units and slot "R" in vertically mounted units. Inter-relay channel communications is not the same as 10/100Base-
F interface communications (available as an option with the CPU module). Channel communication is used for sharing data
among relays.
The inter-relay communications modules are available with several interfaces and some are outlined here in more detail.
Those that apply depend on options purchased. The options are outlined in the Inter-Relay Communications section of the
Order Code tables in Chapter 2.
All of the fiber modules use ST type connectors. For two-terminal applications, each L30 relay requires at least one com-
munications channel.
The current differential function must be "Enabled" for the communications module to properly operate. Refer to

SETTINGS GROUPED ELEMENTS
NOTE
The fiber optic modules (7A to 7W) are designed for back-to-back connections of UR-series relays only. For con-
nections to higher-order systems, use the 72 to 77 modules or the 2A and 2B modules.
NOTE
Observing any fiber transmitter output can injure the eye.
The following figure shows the configuration for the 7A, 7B, 7C, 7H, 7I, and 7J fiber-only modules.
GE Multilin
 
LINE DIFFERENTIAL
Figure 3–29: LED AND ELED FIBER MODULES
L30 Line Current Differential System
3.3 PILOT CHANNEL COMMUNICATIONS
menu.
CURRENT DIFFERENTIAL

3.3.2 FIBER: LED AND ELED TRANSMITTERS

3.3.1 DESCRIPTION

3
3-31