4351B-J Triconex Communication Module

grounded, and the Tricon is operating normally, the wiring and attached devices will not

release sufficient energy to cause ignition in the specified flammable atmosphere.

Termination Panels with Interposing Relays

Termination panels with interposing relays can be used with most digital output modules and

are recommended for these applications:

• Load currents greater than 2 amps

• Field voltages greater than 115 VAC

• Voltage-level conversions

• Motor-starter circuit compatibility

Interposing relay panels are available in these configurations:

• 16-point c

ommoned

• 16-point non-commoned

The digital outputs of the interposing relays are not fault-tolerant. However, each relay

provides an auxiliary contact that can be fed into a digital input to send a loopback signal to the

control program. A user-written loopback check in the control program can ensure that the relay

has achieved its commanded state. The loopback cable must be ordered separately.

Each interposing relay panel provides the capability to common power and return through a

factory-mounted bus-bar arrangement.

Each interposing relay panel consists of:

• A 7 in x 19 in (36 cm x 48 cm) rack-mountable panel with terminals for 16 digital

outputs and 16 digital inputs.

• Two ELCO connectors mounted on the panel for connecting to digital input modules

using digital input cables 9141-010. 9142-010. or 9143-010.

• An EIA standard RS-310-C plate on which the termination panel is mounted.

• A digital output module and a cable compatible with the selected coil voltage.

Bypass Panel for Digital Inputs

Bypass termination panels can be used to connect digital inputs using a bank of 32 pre-wired

switches. Bypass panels have a master keyswitch and terminals for redundant +24 VDC power

sources. Each input point contains an ON status indicator and can be energized only if the

master keyswitch is ON and the corresponding point switch is ON. Each point has a location for

a user-definable label.

Each bypass termination panel comes with one or two 10-foot (3-meter) cables for connecting

the termination panel to a Tricon backplane

RG 1.180 Termination Panels

RG 1.180 termination panels are suitable for use in applications that need to meet the

requirements of Regulatory Guide 1.180. “Guidelines for Evaluating Electromagnetic and

Radio-Frequency Interference in Safety-Related Instrumentation and Control Systems, Revision

1” published by the U.S. Nuclear Regulatory Commission.

Hazardous Location (Nonincendive) Termination Panels

Hazardous location (nonincendive) termination panels are suitable for use in Zone 2. and Class

1. Division 2 field circuits. These panels contain extra circuitry designed to limit power available

to the field terminals and have been examined and certified by TÜV Rheinland as being

nonincendive. This guarantees that if the field wires are accidentally opened, shorted, or