Rockwell Automation T8449 Trusted TMR 24Vdc Valve Monitor Module - Manual

SDS-8449
Trusted TM Industrial Control System
Trusted TM TMR 24Vdc Valve Monitor Module -T8449
Issue 3 Jan 2006
FRONT PANEL
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
TM
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
TM 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
TM 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
TM TMR Processor.
The IEC1131 Toolset uses a pre-
configured 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 TM 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 TM 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
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