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INM 9370-RD Rev 5

22

ALARM MODULE - OPERATION & CONFIGURATION

7.1 

Introduction

As with all redundant systems, early notification of the failure of a system 
component is important so that the fault can be rectified before a second fault 
is allowed to occur. A second fault is likely to interrupt the process, so restoring 
redundant operation is vital in maintaining high levels of system availability. With 
the MTL Fieldbus Barrier, notification of the health of the redundant 9377-FB-R 
barrier modules can be made available to the host control system via the fieldbus 
network. Host notification is achieved using an Alarm Module mounted inside 
the Fieldbus Barrier enclosure. The alarm module is a Foundation Fieldbus Device 
that is connected to the fieldbus segment using one of the six available spurs in 
the enclosure, and appears on the segment ‘live list’ along with other devices that 
are supported on the segment. The device monitors both fieldbus barrier modules 
within the field enclosure, and signals the healthy/failed status of each spur via 
fieldbus Digital Input (DI) function blocks. Each barrier module is assigned its own DI 
function block; the control system must therefore monitor the status of both DIs in 
order to detect a spur or a module failure.

The integrated fieldbus device is also able to provide additional diagnostic 
information that is not normally available in conventional fieldbus barrier 
installations. Importantly, each of the Fieldbus Barrier modules is able to detect a 
short-circuit or a low impedance between the plus (+) or minus (–) connections of 
any spur and the shield (S) of the spur cable. Undetected “short to shield” faults 
jeopardise the reliability of a fieldbus network, because a second fault may cause 
the loss of one or more active spurs. With the MTL Redundant Fieldbus Barrier, as 
well as being indicated by the module’s status LEDs, a “short-to-shield” fault is also 
indicated via status bits contained in the fieldbus alarm module’s Analog Input (AI) 
function blocks. This can therefore give early indication of faults via the fieldbus 
control system, allowing early rectification.

The fieldbus alarm module also incorporates a temperature sensor, which can, 
if required, be used to ensure that the ambient temperature around the Fieldbus 
Barriers does not exceed the 75°C value required to promote reliable operation and 
compliance with certification requirements.

7.2 

Device details

The fieldbus alarm device is an ABB type TTH300. It has a pre-configured device tag  
“MTL 9372-FB”.  It contains the following FF blocks:

Function block type

Default Tag 
name

Use in MTL Alarm application

Resource Block

Resource 
(RB2)

Alarm module internal temperature, bus 
voltage, firmware & hardware versions

DI (digital input)          

Block 1

DI1 (DI)

9377-FB-R module A health status, via PV_D 
value

DI (digital input)          

Block 2

DI2 (DI)

9377-FB-R module B health status, via PV_D 
value

AI (analogue input)     

Block 1

AI1 (AI)

Not used

AI (analogue input)     

Block 2

AI2 (AI)

Short-to-shield detection, 9377-FB-R module 
A, via OUT_D value

AI (analogue input)     

Block 3

AI3 (AI)

Short-to-shield detection, 9377-FB-R module 
B, via OUT_D value

AI (analogue input)    

Block 4

AI4 (AI)

Not used

ePID Block (PID controller 

with expanded features)

PID (PID)

Not used

AO (analogue output) 

Block

AO (AO)

Not used

Summary of Contents for 9372-FB-P Series

Page 1: ...9372 FB Px xx 5 spur redundant fieldbus barrier November 2016 INM 9370 RD Rev 5 Instruction manual MTL fieldbus networks...

Page 2: ...RATION OF CONFORMITY A printed version of the Declaration of Conformity has been provided separately within the original shipment of goods However you can find a copy of the latest version at http www...

Page 3: ...Surge module 9376 SP 13 4 6 Spur connections 13 4 7 Blanking Plugs 14 4 8 Final Checks 15 5 MAINTENANCE 15 5 1 General 15 5 2 Fieldbus Barrier maintenance procedures 15 5 3 Terminator and Trunk Surge...

Page 4: ...semblies may not be used in explosion hazard area applications if they have been used previously in general electrical installations During operation Make the relevant instructions available at all ti...

Page 5: ...elected for critical process applications where failure of the Fieldbus Barrier would otherwise result in unacceptable downtime or lost production It is also ideal for use in Fieldbus Safety Instrumen...

Page 6: ...s 1 2 4 5 and 6 of Module A are shown as active A but spur 3 has failed and effectively gone into standby so module B has automatically taken control of spur 3 A to maintain full service to the affect...

Page 7: ...ase the trunk wiring must be implemented using suitably protected cable The enclosures provide excellent chemical and moisture resistance and are suitable for use in a wide range of corrosive environm...

Page 8: ...INM 9370 RD Rev 5 6 Figure 3 1 External dimensions and mounting hole positions for the stainless steel enclosure Figure 3 2 External dimensions and mounting hole positions for the GRP enclosure...

Page 9: ...maintenance of apparatus and systems is essential and the work should be carried out by suitably trained personnel in accordance with the prevailing code of practice The certification documents speci...

Page 10: ...ut both are suitable for cables from 0 5mm2 AWG 20 up to 2 5mm2 AWG 14 On completion of installation check all blanking plugs and cable glands are tightened to ensure IP rating of the enclosure is mai...

Page 11: ...power supply In this case the trunk and spur cable shields are connected to each other at the Fieldbus Barrier and are not connected to ground in the field For this arrangement connect the carrier shi...

Page 12: ...6 Intrinsically safe spur 4 5 T Host Control System Fieldbus Power Supply 9377 FB R Fieldbus Barrier module 5 6 spur 1 2 3 Fieldbus instruments Non intrinsically safe trunk 9377 FB R Fieldbus Barrier...

Page 13: ...gram and the grounding stud is accessible on the lower left side The trunk terminal connectors are in the middle of the assembly to receive the trunk wiring Terminals are provided to allow a variety o...

Page 14: ...his direction to remove Trunk wiring terminals Trunk cable entry area Protective ground stud Enclosure wall Figure 4 4 Trunk Termination Assembly TTA Active Spare Overall shield Trunk in with Active S...

Page 15: ...emoval details 4 5 Trunk Surge module 9376 SP The 9376 SPTrunk Surge module can be fitted to theTTA to prevent damage to the equipment from voltage and current surges that could occur on the trunk wir...

Page 16: ...ovide a low impedance path for surge currents 4 Fit the connector removed at Step 1 above into the socket on the FS32 and tighten its two securing screws also to a recommended torque of 0 4 Nm Removal...

Page 17: ...are not WARNING Read and understand what work is permitted inside the enclosure Failure to comply with these instructions can endanger the lives or health of personnel and risk damage to the plant an...

Page 18: ...a Fieldbus Barrier module refer to Figure 5 1 Note Before fitting a 9377 FB R Fieldbus Barrier module check the connection pins on its underside to ensure that they have not been bent or damaged in a...

Page 19: ...solid green and all LEDs on Barrier A should pulse to indicate that Barrier A is now in standby mode and Barrier B has become the active barrier 3 Barrier A can now be removed from the carrier followi...

Page 20: ...1 2 Removing a module Refer to Figures 5 3 and 5 4 for further information Removal is a two step process that first breaks the electrical connection followed by the physical removal of the module from...

Page 21: ...ing connector to the carrier and unplug it b Plug the Spur Surge module into the vacant socket on the carrier and tighten the two fixing screws and its grounding screw all to a recommended torque of 0...

Page 22: ...d diagram 5 1 Pressing the A B button will force all spurs to transfer from module A to module B Pressing the B A button will return the spurs to module A Operating the Fail over buttons will reliably...

Page 23: ...al Green steady Active spur OK Green flashing1 Active spur open circuit Green pulsed2 Standby spur OK Yellow flashing1 Active spur short circuit current limit Yellow steady Active spur short to shield...

Page 24: ...ance between the plus or minus connections of any spur and the shield S of the spur cable Undetected short to shield faults jeopardise the reliability of a fieldbus network because a second fault may...

Page 25: ...asurement is repeated in theTemperature Transducer Block SW version Firmware version of the alarm module FW version Hardware version of the alarm module 7 2 2 DI digital input Function Blocks failure...

Page 26: ...for the black alarm connector 2 Loosen the two captive securing screws on the alarm module and lift it away from the circuit board complete with its wiring and connectors 7 3 2 To install an alarm mo...

Page 27: ...ular industries or end users may have specific requirements relating to the safety of their installations and these requirements should also be met For the majority of installations the Directive 1999...

Page 28: ...roduct cannot be repaired by the user and must be replaced with an equivalent certified product 8 5 Marking Each certified component is marked in compliance with the Directive and CE marked with the N...

Page 29: ...FB Px YY 9375 FB Px YY excludes Alarm Module 9377 FB R Module B NOTE CABLE A IS SHOWN IN FACTORY DEFAULT GROUNDING OPTION I E SINGLE POINT GROUNDING AT HOST 1 1 2 NC 1S 2S 3S 1 2 NC PE TRUNK SURGE PRO...

Page 30: ...INM 9370 RD Rev 5 28 This page is left intentionally blank...

Page 31: ...INM 9370 RD Rev 5 29 This page is left intentionally blank...

Page 32: ...ozavodskaya Str 33 Building 4 Moscow 107076 Russia Tel 7 495 981 3770 Fax 7 495 981 3771 E mail mtlrussia eaton com SINGAPORE Cooper Crouse Hinds Pte Ltd No 2 Serangoon North Avenue 5 06 01 Fu Yu Buil...

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