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GE 8103-AI-TX 8-channel AI, 4-20mA

GENERAL

DI modules can accept up to 8, 16, or 32

discrete inputs, depending upon module

type, from dry contacts, NAMUR standard

proximity detectors, or switched voltages.

The source voltage for field switching can

be provided through the module or from an

independent supply out in the field.

In operation, the input voltage is compared

against a threshold voltage to create a ‘true’

or ‘false’ condition. If the inputs are from Zone

2/ Zone 1 or Zone 0 hazardous areas, the

appropriate (2/1) module provides certified

isolation for these signals. A pulse counter is

also included which can count the number of

input pulses for each of the channels.

Input filter

An input filter can be set individually for each

channel to introduce a delay period that

allows the input to settle to a stable value.

When switched off, the bandwidth of the DI

input is 250 Hz (100 Hz for 2/1 modules). The

timeout filter can introduce a timeout delay

of between 2 and 512 ms in 2 ms steps for

2/2 modules and between 3 and 512 ms in

3 ms steps for 2/1 modules. Alternatively,

preset values of “Fast” (22 ms) or “Slow”

(258 ms) may be used.

Latch

Any channel input can be configured to be

“real time” or latched. If the latch feature is

enabled, the polarity can also be set so that

an input signal that goes:

• High will be held high

• Low will be held low

until the latch is released by a command from

the controller. All channels are latched independently and can be cleared simultaneously,

or independently, by a Write instruction to the

module’s latch reset register. If controlled by

a BIM (rather than a Controller) this will occur

automatically in 2 to 3 seconds.

Line fault detection (2/1 only)

When enabled, this will cause a flag to be set

to indicate a short or open circuit fault.

Low-frequency pulse

Counter The DI modules contain a continuously running 16-bit pulse counter that

counts each low-frequency pulse received

on the input. The maximum pulse rate, with

the timeout filter switched off, depends upon

the module selected; consult the individual

data sheets for details. With the filter active,

the maximum pulse rate will be determined

by the timeout period used. In order to start a

particular count the counter must be reset to

zero by a host instruction. When the counter

overflows (i.e. > 65,536 counts) it will restart

from zero.

MODULE OPERATING STATES

“Failsafe” mode

The module supports failsafe mode as defined

in the earlier I/O module introductory section.

Channel Active/Inactive

Each channel can be made active or inactive

individually. When a channel is made inactive:

• Inputs are not processed—i.e. the last input

value is held and not refreshed

• Channel events are not generated

• The counter is not incremented

Power-up conditions

On power-up, or if a reset is executed, the

configuration will automatically adopt

predefined states:

Module mode:

Normal (not “failsafe”)

Channel types:

All latches and filters are off

Active/Inactive:

All channels power-up in the Active state

Visual indicators

On Channel input “high” or latched

Off Channel input “low”

Flashing Line fault detect (2/1 only)

Channel “Status” LED (yellow)

On the DI modules the yellow “Status” LED

reacts in the following way to module conditions.

NOTE: The LED may appear to flash when the input goes

high and low repeatedly

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