abb Triguard SC300E 3BNP004720R101 TMR Safety Products

isolation combined with asynchronous

processors and software voting

ensures the Triguard SC300E is

immune to transient errors.

Smallest Footprint Size

The Triguard SC300E TMR offers our

customers the best utilisation of

available space. ABB have developed

“plug and play” cabinet layout

configurations that offer pre-designed

hardware for system applications.

Plug and socketed system cables make

marshalling and termination

interconnection quick and easy to

implement.

Processor

Each Triguard SC300E TMR system

contains three processors. Each

processor operates asynchronously in

parallel with the other two processor

modules and receives power from the

redundant power supply units in the

main chassis. A triplicated bus system

on the chassis backplane connects

Key features of the processor modules:

• Intel processor

• Battery backed static RAM for

application logic

• RAM Battery backup supply for six

months

• 1 Mbyte of EPROM

• Real time clock for data logging to

10ms resolution

The Triguard SC300E has an operating

system known as the Real Time Task

Supervisor (RTTS), which is installed

in each of the three processors. The

operating system has been proven by

well over 10 million operational hours.

RTTS is transparent to the user, it

controls the off-line/start-up and

on-line continuous diagnostic and

voting functions, and provides a single

environment for the application

programming.

On power up, comprehensive

diagnostic routines check and validate

the correct operating parameters of

each processor.

The Triguard SC300E operating

system, RTTS, will permit the

processors to operate in a 3–2–1

format allowing a system to continue

to function with one healthy

processor. A replaced processor will

automatically acquire the data it

requires to become operational from

the on-line processor before going

on-line.

Input/Output Modules

All I/O module types share an

element of common design, providing

component rationalisation and

implementing distributed processing.

The three isolated TMR signal paths of

all input/output modules are

supervised by a micro-controllers

which:

• Provides fault isolation

• Co-ordinate signal processing

• Provides diagnostics

• Provides on-line to off-line

switching (hot repair)

• Provides data validation routines

• Provides data to the processor

• Provides latent fault detection

A fault in one signal path cannot be

passed to another. I/O modules can

be fitted in any of the 10 slots in any

chassis. “Hot Repair” is a customer

configurable option on a per module

basis. All modules are “keyed” to

prevent improper installation.

Digital Input Modules

The types of digital input modules

available are:

• 32 channel isolated

24Vdc120Vdc120Vac TMR

• 64 channel isolated 24Vdc Simplex

All TMR digital input modules are

100% triplicated to provide maximum

availability.

Each signal path conditions signals

independently and provides full

optical isolation between the field and

the SC300E. A fault on one signal path

cannot propagate to another.

Automatic latent fault testing will

detect “stuck on” states.

Line monitored inputs can be

implemented using analogue input

modules with line monitor termination

cards.

Digital Output Modules

The types of digital output modules

available are:

• 32 channel – supervised 24Vdc

TMR*

• 16 channel – supervised

120Vdc120Vac TMR*

All TMR digital output modules are

equipped with:

• Line monitoring circuits to confirm

energised field loop integrity

• Six element voting circuits for

maximum safety and availability

• Automatic latent fault testing and

diagnostics with 100% coverage (TMR)

Analogue Input Modules

The types of analogue input modules

available are:

• 32 channel isolated 0 to 5Vdc and 0

to 10Vdc TMR

(0 to 40mA and 0/4 to 20mA with

burden resistor at the termination

card)

Each analogue input signal path

contains three identical circuits of:

• Isolation

• Noise Filtering

• Multiplexing

• Amplification

• Analogue to digital conversion

and each of the three circuits is

supervised by a micro-controller.

The three circuits synchronously

measure the input signals, vote the

data and transmit the data to the

processors.

The processors condition the input

signal data, making any necessary

corrections, and then select the

mid-value from the three sets of input