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GE 8101-HI-TX 8-channel AI, 4-20mA with HART

always set on the ‘inner’ side of the alarm limit

to be, typically, greater than the system noise

in the plant. If an alarm is activated, it will

remain until the input moves the full extent of

the deadband towards a “safer” value.

The Hi-Hi and Lo-Lo alarms support the

NAMUR recommendations, i.e. if the alarm

limit is set less than 3.6 mA (Lo-Lo), or greater

than 21.0 mA (Hi-Hi), the alarms must be

active for 4 seconds before the alarm is set.

The Deadband does not apply to NAMUR

alarms. If the alarm limits are set at values

between the NAMUR limits, the alarms function normally.

Dead zone

Each channel has a definable “dead zone”.

This is to reduce the need for the module to

report every minor change in input value. If

the input value differs by the amount defined

by the Dead Zone, or more, then the new

value is reported, otherwise it is not. This

reduces traffic on the internal bus which

improves the system response time. If the

Dead Zone value is set to zero (the default),

then every input value read cycle will set a

‘New Data’ flag, and be reported.

MODULE OPERATING STATES

Normal/Failsafe mode

The AI modules support failsafe mode as

defined in the earlier I/O module introductory section. When not in failsafe the module

adopts Normal mode.

Channel Active/Inactive

A channel can be made active or inactive

individually. When a channel is made inactive

inputs will not be processed.

Default/Power-up conditions

These modules use the following values when

they power up.

Module mode

Normal (not “failsafe”)

Active/inactive

All channels power up in the active state.

Alarms

All alarms are made inactive by having their

values set to high or low extremes, as appropriate.

Dead Zone

0 (i.e. all changes of A/D data are reported for

an active channel)

Software Filtering

Disabled.

Passthrough

Passthrough messages to HART instruments

are always allowed.

Visual indicators

CHANNEL “STATUS” LED (YELLOW)

On Sensor loop OK

Off Open circuit sensor and channel inactive

Flashing Open circuit sensor and channel active

OR Error condition

An error – i.e. a flashing LED – could be as a result of

any of the following conditions:

a) a loss of HART signal,

b) an error in the A/D converter,

c) a NAMUR alarm or

d) a Hi (-Hi) or Low (-Low) alarm.

GENERAL

These modules provide digitised data and

status information of analog measurements

from thermocouples, mV sources, RTDs and

resistance sources.

Thermocouple modules provide four or eight

channels for monitoring input signals from

thermocouples or mV sources. The function

of the module is set up during configuration.

Cold junction compensation for thermo couple applications is provided by means of

a sensor in the field terminal. Only the recom mended field terminals can be used with

these modules.

RTD modules provide four or eight chan nels for monitoring input signals from RTD

or resistance sources. The function of the

module is set up during configuration. The

RTD can be 2-, 3- or 4-wire type. Only the

recommended field terminals can be used

with these modules.

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