Rockwell Automation T8461 User Manual

SDS-8461

T8461 Trusted TMR 24/48Vdc Digital Output

TrustedTM Industrial Control System

Trusted

TMR 24/48V dc Digital Output Module-T8461

FRONT PANEL

DESCRIPTION

The Trusted Output module interfaces to 40 field output devices. Outputs are arranged in five groups of eight. All outputs in a group share a common power source and return. Fault tolerance is achieved through Triple Modular Redundancy (TMR) within the same module for each of the 40 output channels.

The module provides on-board Sequence of Events (SOE) reporting with a resolution of 1ms. The “event”

TMR 24/48V dc Digital

is the actual sensing of the field device loop current.

Each triplicated section (slice) of the module, receives output instructions from the Trusted and sends its data to an internal safety layer hardware voter. Each slice uses the voted data to control the outputs. Every output channel consists of a six-element voted array. The output switch array provides fault tolerant, uninterrupted control under an output switch failure condition. Output switching and fault diagnostics comply with the demanding requirements of IEC61508 SIL-3 for First Fault - Fault Tolerant, and Second Fault - Fail Safe outputs.

When a module fault is detected, the Trusted unhealthy condition, indicating the need to replace the module. Control continues until a replacement (healthy) module is available. Replacement modules can be located in a standby slot next to the module or in a designated SmartSlot with a temporary connection to the same Trusted

Each output is user configurable to perform line monitoring of the connected field devices to detect field wiring and load failures. Automatic over-current protection is inherent in every output circuit which eliminates the need for fuses.

Modules may be placed in any I/O module slot in a Trusted Chassis or Expander chassis. Once the I/O module configuration is set, mechanical keying is available on all I/O modules to prevent inserting a module into an incorrect slot.

TMR Processor will flag the

Termination Assembly.

TMR Processor

Processor

Configuration of the module is carried out using the Trusted running on an Engineering Workstation. Once configured and loaded into the Trusted replacement modules are on-line educated by the TMR Processor.

FEATURES

Toolset

Controller,

 40 TMR output channels per

module

 Five isolated groups of eight

outputs each

 Six-element voted output array

 Comprehensive diagnostics

and self-test

 First fault – Fault Tolerant,

Second fault – Fail Safe

 Line monitoring on a per

channel basis

 Automatic over-current

protection – no fuses required

 2500V dc Opto-Isolation

 Hot replaceable

 Front panel status LEDs for

each channel

 Module fault and status

indicators

 IEC 61508, SIL 3 safety

applications

 On-board 1ms resolution

Sequence of Events reporting

Issue 8 Sep 2006

SDS-8461

Trusted

Industrial Control System

Trusted

TMR 24/48V dc Digital Output Module-T8461

BLOCK DIAGRAM

OFIUHIU

Internal Voting Bus

Interface

TMR Intermodule Bus

Interface

Housekeeping Module Temp

upply Diag

SP reference

ack Plane

Back Plane Power Bus 1

Power Bus

ack Plane Power Bus 2

nterface

Bus

edundant Supply

Slice

Control

ime Stamp

Slice

Control

Time Stamp

lice

ontrol

ime Stamp

Failsafe Bia s Control

lice Power

Supply

Field Logic

Control

ailsafe Bias Control

lice Power

Supply

Field Logic

Control

ailsafe Bias Control

lice Power

Supply

Field Logic

ontrol

Opto Isolat ion Boundary

ront Panel oting Logic

Health

Indicators

iagnostic Monitor

Housekeeping

iagnostic Monitor

Housekeeping

iagnostic

Monitor

Housekeeping

erial Dis play Latches

oted Status Display LEDs

Front Pane l

ELECTRICAL SPECIFICATION

Number of Outputs No. of Independent Power Groups Field Common Isolation

Sustained Working ±250V dc

Maximum Withstanding ±2.5kV dc

Output Voltage Field Supply

Measurement Range 0 to 60V dc

Maximum Withstanding -1 to 60V dc

Output Current Rating

Continuous 0.75A

Output Off Resistance (effective leakage) Power Consumption at 24V (0.75A per channel) Output Turn On/Off Delay Self-Test Interval Output Short Circuit Protection Fusing Intrinsic Safety Circuit Type

40 Channels 5, each of 8outputs

33k=

18W

0.5ms 2 minutes Automatic Not required External barrier Fault tolerant, fully triplicated with optional line monitoring

N.O.

FPIU

FPDU

lice A

Slice B

Slice C

N.C.

OFTU

ield Interfa ce

Protection C ircuit

Group

Fail-Safe

Switch

A B C

MECHANICAL SPECIFICATION

Dimensions (HxWxD):

241mm x 30mm x 300mm (9.5ins x 1.2ins x 11.8ins)

Weight:

1.13kg (2.5lbs)

ENVIRONMENTAL

Operating Temperature:

-5°C to 60°C (23°F to 140°F)

Operating Humidity:

5 to 95%, noncondensing

Vibration:

10 to 57Hz ±0.075mm 57 to 150Hz 1.0g

Shock:

15g, ½ sine wave, 11ms

EMI (IEC 801):

ESD Air discharge to 15kV Contact discharge to 8kV

Radiated Fields 10V/m, 27MHz to 500MHz

Transients and Bursts 2kV, 2.5kHz for t=60 seconds

ICS Triplex

Technical data sheets are intended for information and guidance. The Company has a policy of continual product development and improvement. Specifications are subject to change without notice. For latest information, visit our Websi te:- www.icstr iplex.com