

Introduction
Traditional I/O is a modular subsystem that offers flexibility
during installation. It’s designed to be installed in the field,
near your devices. Traditional I/O is equipped with function
and field wiring protection keys to ensure that the correct I/O
card is always plugged into the corresponding terminal block.
Modularity, protection keys, and plug-and-play capabilities
make DeltaV™ Traditional I/O a smart choice for your process
control system

Benefits
Decreases capital equipment costs
Full system modularity: The Traditional I/O subsystem was
designed with your investment in mind. All components are
fully modular and may be installable under power. You add
I/O interface carriers and I/O interfaces in groups of 4, 8, 16,
or 32 channels as you need them. The modular design enables
you to purchase the exact amount of I/O cards, 8-wide or
4-wide carriers, power/ controllers, and 2-wide carriers you
need and add more DeltaV I/O as your system grows.
Reduced system footprint: The DeltaV system’s state-of-the-
art form factor design of the I/O components enables you to
mount the I/O interface carrier in a junction box in the field
so you significantly reduce the footprint of your equipment
and increase valuable control room space for other uses.
Installation: Save on wiring expenses by installing Classic
Instrumentation in the field, near the actual field devices.
Mounting the controller with the I/O further reduces your
wiring expenditures by eliminating the need for long runs
of multi-cores. The integrated design of the Traditional I/O
subsystem can eliminate the need for marshalling panels.
This saves you even more in your total capital costs.
The provision of in-line fuses and bussed power saves
on installation costs compared with external fuses and
power distribution.
Decreases installation time and expense
Plug-and-play installation saves money: All Traditional
I/O components plug into the I/O interface carrier. You can
install the I/O interface carriers to manage anticipated growth
and postpone the I/O interfaces until you’re ready to install
your additional field devices.
Phased installation saves time: As soon as you mount the
I/O interface carrier, you’re ready to begin installing the field
devices. I/O terminal blocks plug directly onto the I/O interface
carrier. There is no need to have the I/O cards installed.
Keys: Traditional I/O interfaces and terminal blocks have
I/O function keys. These keys ensure that the correct I/O
card is always plugged into the corresponding terminal block.
It’s incredibly easy to use and gives you time to do more.
This design enables you to initially install Traditional I/O
quickly and efficiently. When you need to replace an I/O card,
the function key design ensures that you will always install
it correctly. This keying system provides a safety measure
by preventing the wrong I/O interface’s being installed.
Traditional I/O terminal block.
Increases productivity
Real-time, online equipment additions: Online addition
of new I/O interfaces means your process does not get
interrupted. As new equipment is added, the DeltaV Explorer
acknowledges it and assigns it basic configuration.
Increases process availability
1:1 Redundancy for Traditional and HART I/O cards:
DeltaV redundant I/O uses the same Series 2 I/O cards as
non- redundant I/O. This allows you to leverage your investment
in installed I/O and in I/O spares. No additional configuration
is needed when using a redundant channel. The redundant
terminal blocks provide the same field wiring connections
as simplex blocks, so there is no extra wiring needed.
Autosense of redundancy: DeltaV autosenses redundant I/O,
which greatly simplifies the task of adding redundancy to the
system. The redundant pair of cards is treated as one card
in the system tools.
Automatic Switchover: Should a primary I/O card fail,
the system automatically switches to the “standby” card
without user intervention. The operator is given clear
notification of a switchover at the operator display

Product Description
The Traditional I/O subsystem includes:
I/O interface carrier (a DIN rail surface mounted)
on which all I/O related components are installed.
Bulk AC to 24V DC power supply for field devices.
An I/O interface consisting of an I/O card and an
I/O terminal block.
A variety of analog and discrete I/O cards enclosed
in a common form factor that easily plugs into the
I/O interface carrier.
A variety of I/O terminal blocks mounted on the I/O interface
carrier that can be pre-wired before I/O card installation.
I/O Cards
A variety of analog and discrete I/O cards are available to meet
your specific requirements. The following cards support simplex
or redundant installation:
AI 4-20 mA HART 8 channels
AO-4-20 mA HART 8 channels
DI, 24V DC Dry Contact, 8 channels
DO 24V DC High-Side, 8 channels
A Traditional I/O card easily plugs into an I/O carrier.
AI (Plus) 4-20 mA HART, 16 channels
AO (Plus) 4-20 mA HART, 16 channels
DI (Plus) 24V DC, Dry Contact, 32 channels
DO (Plus) 24V DC, High-Side, 32 channels
The following I/O cards are supported in simplex format
to meet your field wiring needs.
AI Isolated, 4 channels
RTD, 8-channels
Thermocouple, 8 channels
Millivolt, 8 channels
DI, High Density, 32 channels
DI 24V DC Isolated, 8 channels
Multi-Function, 4 channels (Isolated DI)
Sequence of Event, 16 channels (DI 24 V DC)
DI 120V AC Low Side Detection, 8 channels
DI 120V AC Isolated, 8 channels
DO 24V DC Isolated, 8 channels
DO 120/230V AC High-Side, 8 channels
DO 120/230 Isolated, 8 channels
All I/O cards are enclosed in a common form factor that plugs
into the I/O interface carrier. The housing is clearly labeled with
the enclosed I/O card type. All cards have power and internal
error indicators. Eight-channel cards have clearly visible channel
status LEDs.
All cards meet ISA G3 corrosion specifications by the careful
selection of superior electronic components and the use of
conformal coating.
Pulse Counters are available on most DI cards. The supported
maximum frequency varies from 0.1 Hz on AC signals to
75 or 120 Hz on 24V DC inputs. For higher pulse counts,
up to 50 KHz, use the Multi-Function card’s high speed
pulse input.
The DeltaV system provides control module level time
stamping for log events and alarms. For greater event
resolution, the 16-channel Sequence-of-Events DI card
can provide signal driven events to a resolution of +/- 0.25 ms
per card, or within 1 ms per controller. Please refer to
the Sequence-of-Events PDS for more information on
Sequence-of-Event data collection and system options
for this feature

The keying mechanism consists of two keying posts that rotate
and lock into the terminal block base. Each post has 6 positions:
A-F and 1-6. Each card is assigned a unique key, which is marked
on the side of the I/O card:
Terminal block keying example.
The keys prevent installation of an incorrect card, and the
graphical information on the card makes it easy to determine
if a keyed slot will accept a particular card.
There are different I/O terminal blocks available to meet the
wiring needs of field signals.
8-Channel terminal block
Fused 8-Channel terminal block
AI 8-Channel terminal block
2-wire AI Plus 16-Channel terminal block
4-wire AI Plus 16-Channel terminal block
AO Plus 16-Channel terminal block
DI 32-Channel terminal block
DI Plus 32-Channel terminal block
DO Plus 32-Channel terminal block
Isolated Input terminal block
RTD/Resistance terminal block
Thermocouple terminal block
The following redundant I/O terminal blocks are available
on some I/O interfaces, allowing a pair of cards to be installed
as a redundant pair.
Redundant AI 8-Channel terminal block
Redundant AI Plus 16-Channel terminal block
Redundant AO 8-Channel terminal block
Redundant AO Plus 16-Channel terminal block
Redundant Discrete 8-Channel terminal block
Redundant DI Plus 32-Channel terminal block
Redundant DO Plus 32-Channel terminal block
The table on the following page lists the compatible
terminal blocks for each card, along with the cards
unique key positions. The first terminal block listed
is the recommended terminal block.
In addition to standard signal wiring, some cards may also
be ordered with Mass Terminal blocks that allow these cards
to be connected to the M-series Mass Connection Solutions
or third party wiring solutions from Phoenix or if IS Barriers
are required from Pepperl and Fuchs, mounted in an adjacent
cabinet to meet special signal conditioning or for optimizing
field wiring solutions. Please refer to the Alliance Program
website for details on approved third-party products.
10-pin Mass Termination Block (simplex only)
16-pin Mass Termination Block (simplex only)
24-pin Mass Termination Block (simplex only)
40-pin Mass Termination Block (simplex and redundant)
48-pin Mass Termination Block (simplex and redundant)
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