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SafetyNet E
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Tel: +44 (0)1582 723633
Fax: +44 (0)1582 422283
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Tel: +1 603 926 0090
Fax: +1 603 926 1899
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Tel: +65 487 7887
Fax: +65 487 7997
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January 2007
SafetyNet
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is a new addition
to the MTL Open Systems product family. Sharing the
same fundamental platform as the Process Control
products, a new SafetyNet Controller, a new Earth
Line Fault Detect (ELFD) Controller Carrier and two
new SafetyNet IO Modules have been developed
and certified. The SafetyNet System uses the same
field terminals, I/O Module Carriers and Power
Supplies as the Process Control products.
Configuration and application design is carried out
using software tools specifically safety applications -
but within a common programming environment.
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as a
"Programmable Electronic Safety System", MOST
SafetyNet is suitable for use in safety-related
applications up to Safety Integrity Level (SIL) 2. As
part of the family of open system components
designed by MTL for the process automation market,
it can be closely integrated with the MOST Process
Control System or used as a standalone safety
system working alongside any Process Control
solution. The system will also operate "openly" with
your choice of HMI - whatever package you use.
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application requirements
are all met, with certification to IEC 61511 for
process industries and NFPA 85 for burner
management systems.
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the SafetyNet System has
been specifically developed for safety applications,
with features that ensure safety designed in to the
product, with a simple and straightforward Safety
Manual. The net result is a product that is easy to
program, configure and use.
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provides cost effective
solutions to safety applications with limited I/O
counts per node. And since each SafetyNet node can
accommodate up to 64 I/O modules, (each of 8
channels), the requirements of safety systems with
high I/O counts are also met.
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(1oo1D), a single controller, input module and
output module (together with the necessary field
terminals, carriers and power supplies and a
suitable sensor and final element) meet all the
requirements of a SIL 2 safety function.
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can be used to improve
availability for the SIL 2 safety function - with entirely
bumpless transfer. Further availability enhancements
can be made by the use of redundant, fault tolerant
ethernet communications and redundant power
supplies.
Single programming environment
for Process, Logic and Safety
Applications
On-line changes supported
Mounts in harsh and hazardous
environments
SIL2 certified 1oo1D (single Controller
with diagnostics)
Process Control & Safety Functions
from a single platform
Mix standard and SafetyNet
Modules on the same node E
EU
UR
RO
OP
PE
E ((E
EM
ME
EA
A))
Tel: +44 (0)1582 723633
Fax: +44 (0)1582 422283
A
AM
ME
ER
RIIC
CA
AS
S
Tel: +1 603 926 0090
Fax: +1 603 926 1899
A
AS
SIIA
A P
PA
AC
CIIF
FIIC
C
Tel: +65 487 7887
Fax: +65 487 7997
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January 2007
General
The MOST SafetyNet System is a
"Programmable Electronic Safety
System", certified according to IEC
61508 as suitable for use in safety-
related applications up to Safety Integrity
Level 2.
The system is suitable for use in
emergency shutdown, fire & gas and
burner management applications.
New additions to the family
The MOST SafetyNet System uses the same
basic structure as the MOST Process Control
System, but in addition incorporates
specifically developed components. These
are: SafetyNet Controllers (8851-LC-MT) Dedicated Controller Carriers for Earth
Leakage Fault Detection (8751-CA-NS) SafetyNet IO Modules -Analog Input
with HART (8810-HI-TX) and Discrete IO
(8811-IO-DC) Workbench software tools for use with
the SafetyNet System (8841-LC-MT)
Open communications
MTL Open System Technologies products
are just that - open. SafetyNet nodes
communicate with one another, with
standard MOST nodes, historian and asset
management packages and with HMI
packages over a fault tolerant Ethernet LAN,
running at up to 100 Mbit/s.
Peer to peer communication
SafetyNet Controllers can communicate with
one another via Ethernet using SafetyNet
P2P - which has been certified as suitable for
use in SIL 2 applications. Robust checks and
controls on access and data corruption
ensure the safety of communication and
allow safety functions for which the inputs
and outputs are widely separated to be
easily implemented - both in terms of the
software programming and in the hardware
design.
Mixing safe and standard
Standard IO Modules can be mounted on
SafetyNet Nodes - together with SafetyNet
IO Modules - without affecting the node's
functional safety performance. Only
standard applications can read data from
standard Modules, but both standard and
SafetyNet applications are allowed to write
to standard modules. This flexibility can
simplify hardware design, where the
physical constraints of the particular locality
demand such an approach.
Serial interfaces
The Open approach extends to Modbus
serial interface products - which can be
connected to any node (SafetyNet or
standard) by an RS485 connection.
As with data from standard IO Modules, this
data can be read by standard Controllers,
but not by SafetyNet Controllers. Both
standard and SafetyNet Controllers can
write to such devices.
Comprehensive
programming tools
The SafetyNet System is programmed using
the Workbench software package - in
common with the MOST Process Control
Products. In addition to providing the
options of programming the required safety
function in one of three IEC 61131-3
languages (Ladder Diagram, Function Block
Diagram and Structured Text) the package
also provides many useful tools to assist in
testing and commissioning.
Restricted access
Access to modify safety-related parameters
within the configuration and application
program must be restricted to authorised
personnel. The SafetyNet system provides a
number of layers and methods of providing
this protection. Only users with "Safety
Responsibility" can access the safety-related
aspects of the Workbench. Only computers
that the SafetyNet Controller identifies as
"trusted hosts" can download new
parameters. A download can only take
place when an "over-ride key-switch" is set to
the required position. And, if required, each
SafetyNet Controller can be protected by its
own password - without which access to the
safety parameters is denied.
Maintaining field instruments
Maintenance over-rides can be
implemented from operator workstations in
full compliance with the guidelines from
TUV. Users define - as part of the safety
application - the actions to be taken to
maintain a particular instrument and the
SafetyNet System then implements these
pre-defined actions.
HART capability
The SafetyNet System allows full access to
HART field devices for Emerson's AMS
maintenance software. (The first release of
SafetyNet will not have full HART capability,
contact MTL for further information).
Earth leakage detection
Earth leakage fault detection may be
implemented using the 8751-CA-NS
Controller Carrier in conjunction with an
input channel from an 8811-IO-DC Discrete
I/O Module. If ELFD is not required,
SafetyNet Controllers can be mounted on
8750-CA-NS Controller Carriers.
On-line changes
Where allowed by local practices - and
following adequate testing and approval -
new safety programs and configuration can
be downloaded on-line and in real time. In
some situations, this may be possible
without interrupting the operation of the
safety function.
SafetyNet System - Overview Harsh and hazardous
environments
The SafetyNet System is as rugged as the
other MOST Process Control Components:
-40ºC to +70ºC operating ambient
temperature; Zone 2 or Class 1 Division 2
hazardous area mounting; G3 corrosion
resistance; and enhanced shock and
vibration capability. The system will operate
in the most extreme environments found in
process industries, allowing remote
mounting and a truly distributed architecture
in even the most demanding situations.
Event Logging and Sequence
of Events Recording
The SafetyNet System has the same Event
Logging and Sequence of Events (SOE)
recording capability as the MOST Process
Control System. Data received from SafetyNet
Modules is tim