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GE 8021-CE-LH Carrier extender, left hand

Line fault monitoring

In addition to the comprehensive internal

diagnostics the SafetyNet IO Modules can

monitor field wiring for line faults.

Event logging

Data from SafetyNet IO Modules can be

time stamped and stored by the SafetyNet

Controller before being downloaded to the

MOST SOE Data Retrieval Client or a 3rd

party historian package. SafetyNet IO

Module data is time stamped with a

resolution of better than 200ms.

Failsafe Mode

IO Modules will enter Failsafe Mode from

the Running State either due to loss of

communications with the Controller or

because the module has received an

instruction from the Controller to enter the

Failsafe State. In this state:

♦ The Red Fault LED is lit

♦ The IO Module is flagged as unhealthy

to the Controller

♦ All Railbus Write requests are rejected,

except instructions to Reset or to exit the

Failsafe State

♦ Inputs and HART data are read

♦ Outputs are de-energised

♦ Background diagnostics continue and if

a failure is detected, the module will

enter Controlled Shutdown

Controlled Shutdown

A Controlled Shutdown is carried out if a fault

is detected in the Module. In this state it can

communicate the reason for shutdown.

LED’s

A number of LED’s are provided on each IO

Module to provide visual indication of the status

of the Module, its channels and its power supply.

Module ‘Fault’ LED (red)

On - Failsafe

Off - Normal operation

Flashing (equal:mark space ratio) - Cold

start in process, will flash until

communication is established with SafetyNet

Controller.

Blinking (On for a short period, then On

for a longer period – morse code ‘a’) - Fault

state after controlled shutdown

Module ‘Power’ LED (green)

On - Power OK

Off - BFP or Railbus Power Failure

Module ‘Channel’ LED’s

(yellow)

See Individual Module Specifications

Diagnostics

The SafetyNet Analogue Input Module carries

out a number of diagnostic checks to confirm

the accuracy of the measurement reported

and the correct operation of the module.

In addition to the primary measurement, a

second diagnostic measurement is made

using different internal circuitry. The two

values are then compared. The primary

measurement is reported as faulty if it differs

from the diagnostic measurement value by

more than 2%.

Further tests are carried out on internal

supply and references voltages.

If a particular channel fails a test, then that

channel is made inactive. If the failed test

indicates that the Module is not working

correctly, it will enter Controlled Shutdown.

Live maintenance

The field wiring connections to the SafetyNet

Analogue Input Module are classified as

non-incendive and can therefore be live

worked in a Class 1, Division 2 or Zone 2

hazardous area.

(Note the Bussed Field Power connection

must be isolated before the module is

removed or replaced).

Input sampling and filtering

Each input channel is sampled once every

25ms and is filtered by 1st order hardware

and software filters. The software filter can

be disabled or set to a number of different

values according to the filtering

requirements of each channel.

General

The SafetyNet Analog Input Module with

HART provides the interface to 8

channels of 4-20 mA input signals.

The SafetyNet Analogue Input Module is

certified for use in safety-related

applications up to SIL 2. In such

applications the module is used with the

8851-LC-MT SafetyNet Controller and

8811-IO-DC SafetyNet Discrete

Input/Output Module.

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