abb Triguard SC300E 3BNP004720R101 TMR Safety Products

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

data. This mid-value is then used by

the control program.

Analogue Output Modules

• 4 channel – 12 bit resolution

4–20mA TMR

Each of the three Triguard SC300E

processors sends voted output voltage

data to the analogue output modules.

The commands are received via

the bus system by the three

micro-controllers on each module

Pulse Input Analogue Output

Module (PIANO)

• 8 channel, 4 pulse input, 4 analogue

output TMR

The PIANO module contains fully

triplicated circuits. Each pulse input

path receives input pulses, a value

equivalent to the number of teeth on

a gear wheel for example, and

accumulates this data to an accuracy

of +_0.01% over 20Hz to 20KHz.

Output values to 12 bit resolution can

provide voted and validated data to

field devices for control (see analogue

output module for output circuit

operation).

Communications Module

A four channel serial communications

module is always fitted to a Triguard

SC300E TMR system to allow

communications to the engineering

workstation and is installed in I/O slot

number 10 of the main chassis. All

four channels operate RS232423 up

to 19.2 kbits/sec and all four

communication ports are fully isolated.

The four channel communications

module is directly addressed by the

three Triguard SC300E processors and

contains a micro-computer that

controls the four programmable

multi-protocol ports. Data received

from the three processors is voted

2oo3 providing correct data for

onward transmission.

High speed network

connectivity feature (to be

released)

Triguard may be interfaced to standard

communications networks such as

Ethernet/TCP/IP using approved

gateway products.

DCS connectivity includes:

• Yokogawa Electric, Elsag-Bailey,

Fisher Rosemount, ABB, Honeywell

and Foxboro

Hot Repair Facility

A quick repair procedure, once any

fault is revealed, is important in the

total fault tolerant product strategy.

The hot repair facility achieves a quick

and easy repair by the user and this is

done bumplessly without interrupting

the normal operation of the system

and process.

The operating system, RTTS, routinely

executes a hot repair task, checking