2750 Triconex Programmable Controller Module
External Termination Panels
An external termination panel (ETP) is an electrically-passive printed circuit board (PCB) to
which field wiring is easily attached. A panel connector, terminal blocks, and optional
components are mounted to the PCB and enclosed in a DIN-rail compatible plastic housing. A
termination panel and associated cable pass input signals from the field directly to an input
module, or pass output signals from an output module directly to field wiring. This
arrangement permits the removal or replacement of I/O modules without disturbing field
wiring.
Standard termination panels are best for remote marshaling of field wiring where maximum
flexibility, high density and simple maintenance is desired. Standard termination panels allow
you to marshal field signals in a separate enclosure up to 99 feet (30 meters) from a Tricon.
A standard termination panel consists of a PCB with all necessary components—such as two
piece terminal blocks, resistors, fuses and blown-fuse indicators—mounted on a DIN-rail
compatible plastic housing. The housing snaps into mounting rails in accordance with
DIN 50 22.
Compression terminals on the standard panel are designed for use with 24- to 12-gauge (0.3
mm2 to 2.1 mm2) wiring. Some panels have an optional current-limiting series resistor, others
have a fuse with a blown-fuse indicator, to protect the field wiring and field device.
Standard termination panels are pre-configured for a specific application. For instance,
commoned standard termination panels can be ordered with commoned power-and-return, or
redundant DC power configurations with a diode-ORing. The thermocouple input termination
panel provides cold-junction temperature sensors and can be ordered with upscale, downscale,
or programmable burnout detection. A standard termination panel for analog voltage inputs
provides commoned or non-commoned signal returns, while the current-mode version has a
precision resistor at each input point to convert current to voltage.
Each standard termination panel is packaged with a matched interface cable that connects the
panel to the backplane of a Tricon chassis. A female connector at one end of the cable is keyed
to match the male connector on the Tricon backplane. A male connector on the other end of the
cable attaches to the standard termination panel.
In addition to standard termination panels, there are other types of termination panels,
including:
• Basic termination panels
• Hazardous location (nonincendive) termination panels
• RG 1.180 Termination Panels
• Termination panels with interposing relays
• Bypass panels for digital inputs
• Termination panels with RTD/TC/AI input signal conditioning
• Termination panels for 3603B digital output modules
• Termination panels for 3806E analog output modules
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