ST950
Intersection controller
siemens.co.uk/traffic
ITS Detection Solutions
ST950 Intersection controller
The ST950 is the latest in a long line of highly successful
intersection controllers from Siemens. Building on more
than 30 years of microprocessor based traffic controller
design, the ST950 family offers both familiarity and many
exciting new user and maintenance features.
With integrated UTMC based UTC SCOOT, Stratos Remote
Monitoring and MOVA functionality it offers great flexibility,
providing Intersection, Pelican, Puffin and Toucan methods
of control, at both LV (230V) and ELV (40V, 42V and 48V)
output drive level options.
The controller family is compatible with the whole range of
Siemens street-furniture, including Helios CLS LED traffic
signals, LED nearside signals and LED wait indicators, which
all offer significant power and cost savings compared with
conventional incandescent solutions.
Fully integrated UTMC and MOVA 7 functionality
Using a powerful ARM microprocessor core, the ST950 is
able to offer fully integrated UTMC and MOVA functionality
utilising advanced IP communications to the central office,
without the need for additional outstation equipment. Up
to 4 MOVA streams and up to 64 detectors per MOVA
stream are supported.
Each stream is configured using the familiar MOVA set-up
program and communication with MOVA is achieved via an
IP link using MOVACOM. MOVA is also available via the
controllers web browser interface which offers a MOVACOM
like function, allowing MOVA to be accessed remotely and
via non PC devices such as tablets or mobile phones.
MOVA data-sets are able to be changed either locally or
remotely without impacting the running controller onstreet. A MOVA mode is also provided by the controller,
explicitly enabling MOVA control to be reported back to an
associated instation system.
Full UTMC OTU functionality is also supported using the
same principles and offering a similar user experience to
that provided by the Stratos Outstation, minimising user
retraining.
Full Stratos Remote Monitoring functionality is provided
allowing detailed site fault reporting, via the Stratos
system. Remote Monitoring, UTC SCOOT and MOVA
functionality are all able to be used together, as dictated by
traffic engineering needs.
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The controller may be specified to include an additional 2U
equipment rack, which neatly houses the chosen IP
communication router or modem, providing for example,
ADSL, Fiber or 3G communications to the central system.
Easy to use user interfaces
To simplify user interaction with the controller, the ST950
provides an extensive web browser interface which is
accessible either locally or remotely. Offering a consistent
style and where appropriate consistent functionality with
the free standing GEMINI UTMC OTU, this interface is able
to be accessed locally via a USB port on the controller CPU,
via Ethernet (if a communications router is provided) or via
a simple plug-in Wi-Fi interface module.
If necessary the ST950 may be configured to require PKI
certificate access. If enabled, only users who are in
possession of the valid certificate are able to make changes
to the controller data and all such changes are recorded,
along with the name of the person making the changes.
Related data items are conveniently grouped together so
that data changes can be made with the minimum of
page-changing. The interface fully manages the control of
level 3 data items and will actively prevent these from
being changed remotely (as required by TR2500), whilst
ensuring that other changes are able to be made simply
and efficiently.
ITS Detection Solutions
• Fully integrated UTMC OTU and MOVA 7
functionality
• Fully integrated Stratos Remote Monitoring
• Easy to use web based user interface
• Inbuilt live graphical site map
• Unique audible feedback of controller operation to
ease on-street maintenance activities
• Multi-Language capability
• Local and remote user access with optional PKI
security and user action logging
• LV (230V) and ELV (40V, 42V and 48V) lamp drive
systems
• Up to 32 phases, 32 stages and 8 independent
streams.
• Up to 240 digital inputs/output lines
• Integral lamp monitoring of all phases and signal
colours
The browser interface is capable of supporting multiple
languages and new languages are able to be easily added
to the system as required.
The interface also supports a live site map which shows the
status of key items, such as phases and detectors in real
time on a graphical representation of the site.
Signal heads may be shown as aspect displays or as STS
representative symbols allowing users to easily appreciate
the whole site operation in real time. Data for the map
display may be configured locally or imported from the IC4
Emulator tool.
A standard TR2500 25-way serial handset port is also
provided and many controller features are able to be
altered using the traditional Siemens handset mnemonics
if required.
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ITS Detection Solutions
Integrated LV (230V) and
ELV (40V, 42V and 48V)
lamp switching
The ST950 retains the robust and
proven lamp switch designs of the
ST900 family.
When configured as a standard 230V
controller the ST950 supports both
High Intensity incandescent lamps and
also LED signals. Where LED signals are
used, specially adapted lamp switch
cards provide reliable switching and
lamp monitoring, particularly for
Siemens Helios LV CLS LED signals.
• Modular construction -available in an outercase or as a 19 inch, 6U rack
• Simple installation - easily retro-fitted to existing controller cabinets
• Dual processor safety system
• Separate ‘applications’ processor
• Multi-mode operation including advanced ‘ripple’ stage change
algorithm
• Supports configuration changes with signals on
• Fully approved to UK Highways Agency specification TR2500 and TR2513
The ST950 ELV implements the proven
Siemens full wave rectified ‘DC’ system
which offers a wide range of benefits,
including:
• Increased electrical safety for
members of the public in the event
of damage to the signal installation
• Increased electrical safety for
personnel working on or around the
intersection
• Reduced power costs
• Reduced cabling costs
• Reliable lamp monitoring of very
low power LED traffic and
pedestrian signals
• Low supply current in-rush versions
minimising supply fusing and
supply capacity requirements
To deliver these benefits, the ST950
ELV incorporates many unique design
features including:
Use of a fully rectified ELV supply:
The use of a full wave rectified ELV
supply allows very efficient
semiconductor switches to be used,
reducing unnecessary heating effects
in the controller, contributing to
improved reliability and lower power
consumption.
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ITS Detection Solutions
Active short circuit protection on all
outputs: Often the most frequently
damaged components within a traffic
controller are the output drive
switches, which are particularly
vulnerable to cable faults and short
circuits. The ST950 ELV design
incorporates an active short circuit
protection system on all lamp outputs,
ensuring that even under direct short
circuit conditions, the outputs are
protected from damage.
Active residual current quench on all
outputs: The power requirements of
LED-based street furniture are
becoming ever lower. As this occurs,
there is an increased risk that stray
and residual voltages, remaining
present after a signal is switched off,
will cause the controller to register
conflict or correspondence faults
incorrectly. The ST950 ELV is ready
today to deal with the very low power
signals expected in the future, as each
output is equipped with an active
circuit that eliminates these stray
voltages, without wasting power
when the signals are switched on.
Intelligent lamp switch system: The
ST950 ELV provides an intelligent lamp
switch card that implements full
voltage monitoring on each of its 32
outputs, using two separate safety
systems. Current and voltage
monitoring on each output is also
provided, so that any output may be
used for any signal colour.
Additionally, ELV LED traffic signals as
well as LED nearside and LED wait
indicators can be monitored directly,
without the need for any additional
intelligence in the signals themselves.
This high degree of flexibility allows
output use to be optimised, for
example, only using a single drive for
green arrows, making the most
efficient use of the available controller
hardware.
By default ST950 ELV controllers
provide a nominal 48V lamp drive
level, reducing to 27.5V when the
signals are dimmed. Optionally the
controller can provide either 40V or
42V drive levels, by the provision of an
alternative ELV output transformer.
The ST950 retains
the robust and
proven lamp switch
designs of the
ST900 family.
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ITS Detection Solutions
Enhanced I/O
capability
Using its internal serial architecture,
the ST950 family is able to support up
to 240 I/O lines allowing up to a
maximum of 240 digital inputs or up
to 96 isolated digital outputs to be
provided, depending on the controller
configuration.
The serial I/O cards are designed as
‘intelligent terminal blocks’ and are
located directly where needed within
the controller cabinet to optimise
street wiring. In installations where
very large numbers of street cable
connections are needed, the serial bus
architecture allows the I/O cards to be
easily located in an adjacent cabinet,
easing potential installation problems.
To aid flexibility further, standard loop
detector cards are also connected to
the controller using the same efficient
serial bus, via intelligent backplane
adaptor cards.
The ST950 also fully supports the
WiMag (magnetometer) I/O card,
which when fitted in a WiMag rack
allows up to 60 magnetometers to be
efficiently interfaced directly to the
controller without the need to use
detector backplanes.
Modular construction
Three main construction options are
available, which are modular and can
be expanded to meet the needs of a
wide range of intersection
applications:
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ITS Detection Solutions
Standard 230V (LV) outercase: A single-door outercase
providing a 6U controller logic rack and equipment
mounting frame, as well as extensive street cable
termination capability. Up to 32 phases can be
accommodated together with detectors and ancillary
equipment including freestanding Outstation Transmission
Units (OTUs), Outstation Monitoring Units (OMUs) and
other approved items. Manual panel access is provided
through a separately locked access door contained within
the main outercase door.
Standard 48V (ELV) outercase: This offers the same basic
outercase as the LV system but with an enhanced 6U
controller rack. This accommodates the ST950 central
processor and logic power supplies, as well as space for up
to 12, 4-channel detector cards and a UTMC OTU or MOVA
unit if these facilities are not provided using the fully
integral facilities.
Flexibility is enhanced by locating the lamp switch cards
directly within the controller cabinet, very close to their
street cable termination positions, minimising
interconnecting cables and improving reliability. Where
very large intersections are to be accommodated,
additional ELV lamp switch and I/O cards may be located in
an adjacent cabinet, significantly easing installation and
maintenance of street wiring.
Uniquely the controller is able
to provide audible feedback,
in the form of spoken phrases
via a plug-in Bluetooth
dongle, to a Maintenance
Engineer on site utilising his
mobile phone or other device
capable of establishing a
Bluetooth link with the
controller.
Optionally, the ELV controller can provide either 40V or 42V
drive levels, by the provision of an alternative ELV output
transformer.
Free standing logic rack: Rack-only solutions are provided
for both the LV and ELV controllers, housing the main logic
power supplies, central processor and lamp switch cards.
An extensive range of mounting kits are available for fitting
the ST950 into a variety of existing cabinets, providing a
particularly cost-effective route to controller modernisation.
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ITS Detection Solutions
Simplified installation
and maintenance
Installation is simplified by the modular nature of the
equipment. The controller root and cabinet, complete with
street cable and mains supply termination may be installed
without the logic rack, which can be added at a later date.
The controller also supports the latest NAL bases, providing
easy connection to integrated duct works.
Uniquely the controller is able to provide audible feedback,
in the form of spoken phrases via a plug-in Bluetooth
dongle, to a Maintenance Engineer on site utilising his
mobile phone or other device capable of establishing a
Bluetooth link with the controller. For example an Engineer
may select a detector input to monitor and move to the
location of that detector. The controller will “talk” to the
engineer via the Bluetooth link and tell him when the loop
input is active, enabling him to focus on observing vehicles
moving over the loop rather than trying to visualise both
activities on the street and data being displayed on a
terminal device.
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In addition, many changing controller parameters may be
displayed visually, as a time-based graph, aiding the
Engineer when diagnosing intermittent or infrequent
events.
An extensive inbuilt self-test facility, which validates both
the controller hardware and the street connections,
provides a further invaluable aid to controller
commissioning.
The controller is also able to provide a full statement of
timing, and other data, including detailed hardware
information about all intelligent PCBs fitted in the
controller, formatted to be used as part of an annual
Periodic Inspection report. The report is able to be simply
exported from the controller to a PC from a web page
locally or remotely. Alternatively it can be exported directly
to a USB memory stick on site using simple handset
commands.
Reliable facility-rich software
The ST950 facility set is based on the well proven and
highly reliable ST900 and offers many features and facilities
including:
• 32 phases, 32 stages.
• 8 streams.
• 8 maximum green sets.
• 8 hurry calls which are in priority order.
• 8 uni-directional detector loop units.
• Multi-mode operation with stage ripple change facility
for improved intersection capacity.
• Fully integrated Light Rapid Transport
• (LRT) mode for use at Tram / Road intersections.
• Fully configurable lamp sequences for worldwide
application.
• Fully integral and configurable lamp monitoring of both
incandescent and LED signals.
• Flexible part-time and start-up modes, allowing any
stream to be sent in and out of part-time mode without
affecting any others.
• Cableless linking (Plan) facility with sophisticated plan
timetables and 32 plan groups.
• Event timetable which supports actions based on 32
independent events with easy programming.
• Time system with full date details –automatically time
synchronised to central system where the controller
linked to Siemens UTMC central system.
• Date stamped rolling log providing detailed history of
events and faults, coupled with improved presentation
to aid recognition of entries.
• Uncomplicated web browser user interface capable of
multi-language support
Enhanced safety features
Two independent microprocessors and comprehensive
hardware self-check features ensure an
unprecedented level of controller safety. All phase
output colours are provided with dual-channel voltage
monitoring, allowing the controller to be configured
to perform green-green, green-yellow and green-red/
yellow conflict monitoring.
In addition the controller offers in-built lamp
monitoring sensors to allow a wide range of tungsten
halogen, tungsten filament and LED-based signals to
be monitored for failure. For UK applications, conflicts
or other major failures result in the signals being
extinguished in a fail-safe manner.
For non-UK use, the controller has an option to
feature a built-in fail flash system. This offers
selectable ‘off’ or flash red/yellow for each phase, with
programmable mark/space and flash rate.
ITS Detection Solutions
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ITS Detection Solutions
User configurable
The ST950 is highly user configurable
allowing it to be programmed to meet
almost any traffic control demands.
The IC4 configurator is an easy to use
tool for generating configuration data
sets for the complete family of
Siemens controllers, including the
ST700, ST750, ST800, ST900 and
ST950. Most data is simply entered via
a series of ‘forms’ and is validated for
correctness as part of a sophisticated
error checking process. Enhanced
navigation aids and selectable levels of
configuration complexity, insulate the
user from controller facilities that are
not being used, simplifying the
configuration process.
An extensive traffic conditioning
language is also supported, enabling
complex special conditions and
actions, over and above those offered
directly within the controllers
operating firmware, to be efficiently
programmed.
The configuration data created by IC4
may be loaded into the controller
using several different methods:
• On-Street, directly from a PC, via
the USB handset interface.
• On-Street, directly from an
appropriately configured USB
memory stick.
• Remotely, by downloading the
configuration from a central office.
Depending on national regulations,
the new configuration can either be
enabled remotely or be held waiting
for an engineer to activate it onstreet.
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ITS Detection Solutions
Subject to safety constraints, most
configuration data, including UTMC
OTU and MOVA datasets may be
loaded into the controller and
activated whilst the signals remain
illuminated, ensuring minimum
disruption to traffic whilst a
configuration update is undertaken.
The configuration data as well as
controller fault and operation logs and
many other controller operating
parameters are stored on a removable
SD card held on the main controller
CPU card. In the unlikely event of a
CPU card failure this card may be
removed and installed into the
replacement CPU, returning the
controller to operation which exactly
replicates the original.
This card may also be used to store
other data such as site drawings, log
book information, controller
handbooks and other site notes that
may be of help to a maintenance
engineer on-site.
Configuration data can be retrieved via
the USB web interface and easily
imported back into IC4 for re-editing.
Existing data from T200, T400, ST800
and ST900 controllers can be imported
as the basis of new ST950 family
configurations, significantly easing
controller upgrades.
The optional controller emulator links
seamlessly with IC4 to provide an
advanced environment for de-bugging
and proving ST700, ST800, ST900 and
ST950 controller family configurations.
It ensures an accurate representation
of the controller’s operation on a PC,
using the same software source files
as the appropriate controller firmware.
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ITS Detection Solutions
Technical Specifications
Approvals and specifications
• Highway Agency Approved to
TR2500 and TR2513 and TOPAS
Registered
• Compliant with relevant sections of
TR2523
- Traffic Control Equipment
Interfacing
• CE Approved
• RoHS Compliant
Inbuilt modes of operation
• Manual
• Fixed-Time
• Vehicle Actuated
• Urban Traffic Control
• MOVA (Implements MOVA 7)
• LRT
• Pedestrian Fixed Vehicle Period
• Pedestrian Vehicle Actuated
• Part-Time
• Cableless Linking
• Hurry Call
• Emergency Priority
Phases and stages
• Number of hardware phases: 1-32
(Phase sequences programmable)
• Number of independent streams: 8
• Number of stages: 32
• Number of switched signs: 0-32
• Number of max. green periods per
phase: 8
• Number of phase delays: 120
• Number of call and cancel timers: 8
• Number of stage-based all red
extension units: 7
• Number of phase-based intergreen
delays: 64
• Number of hurry calls: 8
• Number of emergency/priority
units: 8
High-speed vehicle detection
Integral speed discrimination, double/
triple speed assessment
• Number of assessors: 16
Cableless linking facilities
• Number of plans: 16
• Number of groups per plan: 32
• Number of time switch settings: 64
• Number of group influences: 10
• Timing sources 50/60Hz mains,
Internal Crystal, NTP network time
server or optional GPS clock
Inputs and outputs
• Number of digital inputs: 0-240
compliant to TR2523
• Number of isolated digital outputs:
0-96 compliant to TR2523
(Actual number of inputs and outputs
possible depends on configuration, up
to a maximum of 240 in total)
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ITS Detection Solutions
Environmental
• Designed to meet:
- EN12675
- EN50278
• Supply interruption: Continuous
operation up to 50ms break
• Supply failure: Automatic restart
without operator intervention
• Operating ambient temperature
range: -25°C to +70°C
Lamp switch
Standard 230V controller
• Lamp switching type: Solid state
triac
• Number of phase outputs per lamp
switch card: 24 (arranged as 8 x 3
aspect phases)
• Maximum lamp load per output
switch:
- Standard Controller: 4A
- LED Controller 4A
(monitoring limited to 1A load)
• Maximum number of lamp switch
cards: 4
• Maximum total lamp load: 20A
• Lamp supply voltage: As per input
supply
• Signal dimming: 120V, 140V, 160V
AC RMS.
• Maximum lamp load per output
switch: 2A (A phase may use
multiple outputs where higher
current required)
• Number of lamp switch cards
supported: 6 (3 max per ST950
cabinet)
• Maximum total lamp load: 20A
• Heavy current options: 40A
• Lamp supply voltage: 48V RMS,
(rectified and negative
w.r.t. protective earth)
• Signal dimming: 27.5V RMS,
(rectified and negative w.r.t.
protective earth)
• 40V and 42V ELV lamp supply drives
available as an option
Other facilities
• Fully integrated MOVA 7
• UTMC SCOOT UTC and Stratos
Remote Monitoring functionality licensed by Smart Card
• Standby mode:
- Signals off
- Software flash
• Failure modes:
- Signals off
- Independently controlled fail flash
- Software flash on a per-stream
basis
Flash type – selectable: flash red or
yellow per phase Mark/space and flash
rate selectable for whole controller
• Web based user interface with
audible feed for maintenance
activities
• High-speed handset port 1200,
9600 and 19200 baud. Port is auto-
Note 1: Dimming not supported for
100V and 110V mains input.
Note 2: 120V dimming not
recommended for LED controllers
ELV controller
• Lamp switching type: Solid state
FET
• Number of phase outputs per lamp
switch card: 32 (each fully
configurable as red, yellow or green
drives)
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ITS Detection Solutions
Technical Specifications
Electrical
• Input power supply (+20, -15%):
100V, 110V, 220V, 230V, 240V AC
RMS
• Supply frequency: 50/60Hz ±4%
Dimensions
Standard outercase
• Height: 1160mm
• Width: 725mm
• Depth: 420mm
Rack system
• Height: 266mm
• Width: 482mm
• Depth: 280mm
requires minimum 15mm clearance in
front of fixing plane)
Compatibility
• Able to drive and lamp monitor:
- Standard UK HI incandescent
signals
- Standard UK LV regulatory signs
- Siemens Helios LV LED signals
- Siemens Helios ELV signal heads
- Siemens Helios ELV regulatory
signs
- Siemens ELV nearside indicators
- Siemens ELV LED wait indicators
Other signals may be compatible –
consult Siemens for details bauding to
match incoming data
Cuckoo kits
ST950
• Siemens T400, ST800,
• Microsense MTC and Sentinel
• Peek TSC3 and TRX
ST950 ELV
• Siemens T400, ST800
• Microsense MTC and Sentinel
• Peek TSC3 and TRX
Upgrade kits
• Siemens ST900 and ST900ELV
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Siemens Mobility Ltd
Sopers Lane
Poole
Dorset
BH17 7ER
Tel: +44 (0) 1202 782000
Email: sales.stc@siemens.com
siemens.co.uk/traffic
All hardware and software names used are brand names and/or
trademarks of their respective holders.
© Siemens 2020.
Right of modifications reserved. Printed in the UK
This publication is issued to provide outline information only, which
(unless agreed by the Company in writing) may not be used, applied or
reproduced for any purpose or form part of any order or contract or be
regarded as a representation relating to the products or service
concerned. The Company reserves the right to alter without notice this
specification, design, price or conditions of supply of any product or
service.
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