Rockwell Automation T8449 User Manual

SDS-8449

T8449 Trusted TMR 24Vdc Valve Moni tor

OUT

TrustedTM Industrial Control System

Trusted

TMR 24Vdc Valve Monitor Module -T8449

FRONT PANEL

19 20

DESCRIPTION

To meet the demanding requirements of Safety Integrity Level (SIL) calculations, final elements of a safety function such as shutdown valves require regular testing.

The TUV approved (AK6, SIL3) Trusted TMR Valve Monitor module, will control any valve connected to it and test the valve at regular intervals. It is used in place of a normal controlling output module where the automatic valve testing function is required. The Valve Monitor will perform the partial stroke tests, monitor the results and pass on information for display, alarm and historical record via the application program of the Trusted

controller.

Maximum test times are derived for each valve to ensure the test can only move the valve for a period which will not cause disturbance to the process. This method of partial stroke testing exercises the entire shutdown path from safety system logic to movement of the valve actuator. The test verifies the ability of the valve to perform its shutdown function.

Triple Modular redundancy (TMR) is used to ensure fault tolerance. The system will continue uninterrupted, safe operation in the presence of one or more internal discrepancies. Features typical of all Trusted

output modules are included, such as, line monitoring, fuseless protected outputs, 1msec sequence of events (SOE) resolution, configurable LED colours and field signal monitoring.

The Valve Monitor connects to 20 valves by providing 20 control outputs and 20 monitoring inputs arranged together in pairs. These pairs are in 5 isolated groups with separate power feeds to each. The outputs connect directly to the Solenoid Operated Valve (SOV) or via an Intrinsically Safe interface in the usual way. Outputs can be normally energised or de-energised, open or closed. Feedback of valve position can be by limit switches or an analogue position sensor. The Valve Monitor connects to the field circuits via a Versatile Field Termination Assembly (VFTA). The VFTA allows the user to link configure an appropriate electrical loop for the control and monitoring signals.

The signals that control valve open and closed state, plus the requests to test, are derived from the application program running in the Trusted

TMR Processor. The IEC1131 Toolset uses a preconfigured function block to marshall signals to and from the Valve Monitor. The unique characteristics of each valve such as test time, feedback thresholds and alarm conditions, are also set in the IEC 1131 Toolset and can be modified online. Control of the testing can be based on time of day, time interval or manually initiated from the Valve Manager operator interface.

The module has extensive automatic diagnostics. Should a fault in the module be detected, the Trusted

TMR

Processor will flag the 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 Companion Slot next to the faulty module or in a designated SmartSlot with a temporary connection to the faulty module.

Modules may be placed in any I/O slot in a Trusted

Processor Chassis or Expander chassis. Mechanical keying prevents insertion of the incorrect module.

FEATURES

 40 TMR channels to control

and test 20 shutdown valves

 Partial stroke testing

embedded in TMR safety system

 Tests valves to AK6 or SIL3

application requirements

 Use with single or dual SOV’s

for maximum process availability

 No added hardware so no

increase in MTBF

spurious

 Line monitoring

 Automatic over-current

protection – no fuses required

 Hot replaceable

 Can be installed as retrofit

using existing field installation

 Maximum increase to safety

integrity for minimum cost

 On-board 1ms resolution

Sequence of Events reporting

Issue 3 Jan 2006

SDS-8449

Trusted

Industrial Control System

Trusted

TMR 24Vdc Valve Monitor Module -T8449

BLOCK DIAGRAM

OFIUHIU

nternal Voting Bus

TMR Intermodule Bus

Housekeeping Module Temp

DSP reference

Back Plane

ack Plane Power Bus 1

Power Bus

Back Plane Power Bus 2

Bus

Interface

Bus

Interface

Bus

nterface

Supply Diag

Redundant Supply

lice

Control

ime Stamp

lice

Control

Time Stamp

Slice

Control

ime Stamp

Failsafe Bia s Control

lice Power

upply

Field Logic

Control

ailsafe Bias Control

lice Power

Supply

Field Logic

Control

ailsafe Bias Control

lice Power

Supply

Field Logic

Control

Opto Isolat ion Boundary

Front Panel

oting Logic

Indicators

Health

Voted Status Display LEDs

Serial Dis play Latches

iagnostic

onitor

ousekeeping

iagnostic Monitor

Housekeeping

iagnostic Monitor

Housekeeping

ront Panel

N.O.

FPIU

FPDU

Slice A

lice B

N.C.

Slice C

N.C.

ELECTRICAL SPECIFICATION

Number of channels

No. of Independent Power Groups Field Common Isolation

Sustained Working ±250V dc

Maximum Withstanding ±2.5kV dc

Field Supply Voltage

Measurement Range 0 to 32V dc

Maximum Withstanding -1 to 40V dc

Output Current Rating

Continuous 2 A

Minimum 50ma Output Off Resistance (effective leakage) Power Consumption at 24V (1A per channel) Output Turn On/Off Delay Self-Test Interval Output Short Circuit Protection Fusing Intrinsic Safety Circuit Type

40 Channels – 20 control, 20 monitoring 5, each of 4 outputs & 4 inputs

33k>

24W

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

OFTU

.C.

ield Interfa ce

rotection C ircuit

roup

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 iple x.com