Siemens ST950 User manual

667/HE/53000/000
Plus+
ST950 Plus+ User Manual
Sept-19
Issue 6
Apr-21
Issue 2

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Change History
Version
Date
Change
Author
1
Jan 2020
First Issue
Siemens
2
Apr 2021
Updates and corrections
Siemens
The electronic version of this handbook can be found on the Siemens website
www.siemens.co.uk/traffic in the Handbooks section under Downloads.
SAFETY INFORMATION
General Hazards
IT IS RECOMMENDED THAT DUE TO THE MAINS PRESENT WITHIN THE CONTROLLER CABINET ALL
POWER TO THE CABINET IS DISCONNECTED BEFORE REMOVING OR INSTALLING ANY MAINS POWERED
EQUIPMENT INTO THE CABINET. WHERE A RISK ASSESSMENT AND METHOD STATEMENT FOR THE
WORKS TO BE COMPLETED AND / OR THE INSTRUCTIONS FOR THE EQUIPMENT BEING INSTALLED OR
REMOVED ALLOWS, LIVE WORKING MAY BE CONSIDERED.
Safety of Installation and Maintenance Personnel
In the interests of health and safety, when installing, using or servicing this equipment the following
instructions must be noted and adhered to:
(1) Only skilled or instructed personnel, with relevant technical knowledge and experience, who are
also familiar with the safety procedures required when dealing with modern electrical/electronic
equipment, are to be allowed to use and/or work on this equipment. All work shall be performed
in accordance with the local regulations1.
(2) Such personnel must take heed of all relevant notes, cautions and warnings in this Handbook and
any other Document or Handbook associated with the equipment including, but not restricted to,
the following:
i. The equipment must be correctly connected to the specified incoming power supply.
ii. Only trained / competent persons should work on this equipment.
iii. Any power tools must be regularly inspected and tested.
iv. Any personnel working on site must wear the appropriate protective clothing, e.g. reflective
vests, etc.
1
For UK this refers to Electricity at Work Regulations 1989.

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Re-Commissioning the Junction
When re-commissioning signals, the following sequence is recommended to ensure that the correct
signal start-up sequence is followed:
•Switch OFF the controller at the main switch
•Switch ON the lamps at the Manual Panel on/off switch
•Switch ON the controller at the main switch
More specific safety information is given in the text of the handbook, where it relates to specific
activities or situations.
RJ45 Connections
There are various RJ45 connectors used to connect to peripheral cards within the ST950 family of
controllers. Most are not Ethernet ports and should not be connected to other equipment, including
PCs.
To isolate the equipment, the Master Switch must be in the “Off” position.
Removal of the Electricity Board Fuse or Switching the Controller switch or the Manual Panel Signals
On/Off switch to “Off” does not guarantee isolation of the equipment.
Equipment Compatibility
Do not connect any device that has not been specifically designed or evaluated for compatibility with
the ST950 Plus+system. If in doubt, contact Siemens Mobility Limited for further information.
ST950 Plus+compatible equipment such as Helios Plus+traffic signals, near-side pedestrian signals and
Plus+LED regulatory signs are all clearly marked “Plus+”. If equipment is not marked “Plus+” then
additional care should be taken to ensure that it is suitable for use in a Plus+system.

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Safety of Road Users
It is important that all personnel are aware of the dangers to road users that could arise during repair
and maintenance of traffic control equipment.
Ensure that appropriate traffic management and is signed at the junction area to warn motorists and
pedestrians of any dangers and to help protect the personnel working on the site.
Whilst repairing signals which are in an "all-out" condition, care must be taken to ensure that no spurious
signals are lit during testing which could mislead drivers or pedestrians.
Particular care is required where pedestrian audible devices are installed, to ensure that no false
indications are given during, for example, cable testing. Personnel should also ensure the safety of
pedestrians, especially children, who may come into contact with parts of the controller or signal poles.
Safety of Lithium Battery
This equipment may contain a Lithium coin cell (battery) if the optional RTC battery backup kit is
installed.
Do not short circuit, recharge, puncture, take apart, incinerate, crush, immerse, force discharge, ingest
or expose to temperatures above the declared operating temperature range of the product, otherwise
there is a risk of fire or explosion.
Batteries should be handled and stored carefully to avoid short circuits. Do not store in disorderly fashion
or allow metal objects to be mixed with stored batteries. Keep batteries between -30°C and 35°C for
prolonged storage.
The battery is a sealed unit which is not hazardous when used according to these recommendations. Do
not breathe vapours or touch any internal material with bare hands should the cell become damaged in
any way.
Battery disposal method should be in accordance with local, state and government regulations. In many
countries, batteries should not be disposed of into ordinary household waste. They must be recycled
properly to protect the environment and to cut down on the waste of precious resources.

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Important Plus+Considerations
To provide the most reliable operation, the Siemens ST950 Plus+controllers use a DC supply.
To maintain all street voltages within ELV limits, equipment outside the cabinet must be supplied
with voltages within the band 0 to +48V DC with respect to earth. Voltages beyond that will result
in overall voltages within the system being in excess of the ELV limit as defined by BS7671.
Care should be taken to ensure that no LV (Mains Voltage) equipment is installed within the ST950 Plus+
street furniture as this will result in risks to personnel and risk of catastrophic failure of equipment.
The Siemens ST950 Plus+controller has been designed and proven to meet the following requirements
for Protective Extra Low Voltage (PELV) and the operation of a signal compliance monitoring system
with ELV voltages:
1) The Siemens ST950 Plus+system is PELV and the earth is connected all the way through, as allowed
for in BS7671 414.4.1. The source is a safety isolating PSU as allowed in BS7671 414.3 (iv). Protective
Isolation within the controller cabinet is achieved between the PELV circuits and those higher than band
I by ALL conductors having insulation rated for the highest voltage 250V, as mandated for in BS7671
414.4.2 (iii), and where the parts of the circuits are not wires / conductors, then physical isolation as
allowed for in BS7671 414.4.2 (v) may be used.
Disposal
As will all modern equipment, there are a number of security artefacts that exist within the hardware.
When replacing equipment, the swapped-out CIC and Nodes must be disposed of in a secure way.

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Contents
Change History ..................................................................................................................2
SAFETY INFORMATION .......................................................................................................2
1Introduction ..................................................................................................................8
Purpose ..................................................................................................................8
Contact Us..............................................................................................................8
Reference Documents .............................................................................................8
Pre-Requisites .........................................................................................................9
Definitions............................................................................................................11
Abbreviations .......................................................................................................11
Third Party Information .........................................................................................13
Trademarks...........................................................................................................13
2Plus+Introduction and Basic Principles ..........................................................................14
Plus+ System Components: An Overview................................................................16
The Principles of Plus+Wiring.................................................................................19
Configuration .......................................................................................................23
Plus+: Key Considerations......................................................................................25
3ST950 Plus+Controller Cabinet .....................................................................................27
The Primary Plus+Controller Cabinet ......................................................................27
The Controller Rack ...............................................................................................29
Cabinet Stool Options............................................................................................30
Master Switch Panel..............................................................................................31
24V PSU ...............................................................................................................33
48V PSU ...............................................................................................................33
Redundancy Module..............................................................................................34
ST950 Plus+CPU Card ............................................................................................36
Fuses....................................................................................................................44
Heart of the Controller ..........................................................................................44
Gemini3 (Stratos Outstation).................................................................................45
Panel Mounted I/O Cards .......................................................................................46
CPU I/O Card .........................................................................................................49
Intelligent Detector Backplane Card........................................................................51
Loop Detector Cards..............................................................................................55
CIC Card and CTB (Backplane) ................................................................................56
Manual Panel........................................................................................................67
4ST950 Plus+System Components : On Street.................................................................70
Pole Top Board......................................................................................................70
Plus+Signal Head ..................................................................................................74
Pedestrian Demand Unit (PDU) ..............................................................................80
Wait Indicator .......................................................................................................84
Nearside Display Unit and Nearside Combined Unit.................................................86
ELV Solar Cell........................................................................................................89
Above Ground Detectors .......................................................................................90
Regulatory Sign.....................................................................................................92
Smartloop.............................................................................................................93
5User Interface..............................................................................................................99

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Connection...........................................................................................................99
Types of User Interface..........................................................................................99
6Installation and Commissioning Procedure..................................................................101
Service-Centre Cabinet Testing ............................................................................101
Checking Site Suitability ......................................................................................102
Cabinet Installation - Summary ............................................................................103
Installation of Stool .............................................................................................104
Installation of Traffic Signal Poles.........................................................................104
Site Cable Installation..........................................................................................104
Re-fit the Controller Electronics (if applicable).......................................................110
Installing the On Street Equipment ......................................................................111
Controller Commissioning ...................................................................................111
Customer Acceptance..........................................................................................130
7Leaving Site...............................................................................................................131
8Routine Maintenance Procedures ...............................................................................132
Routine Inspection of Signal Equipment ...............................................................132
Routine Inspection of Pedestrian Signal and Demand Equipment...........................132
Routine Inspection and Electrical Testing of Controller ..........................................132
Routine Setup Check ...........................................................................................135
Other Maintenance Operations............................................................................135
9Fault Finding .............................................................................................................136
Site Visits............................................................................................................136
Fault Finding using the Fault Log and Discrepancy Report .....................................137
Fault Finding Starting from the Fault Indications...................................................137
Replacement of Cabinet Mounted Cards...............................................................141
Replacing On-Street Equipment for Maintenance..................................................152
Logging/Recording Faults and Visits .....................................................................163
Part Numbers and Spares List......................................................................164
A.1 Spares Parts List: Cabinet Mounted Equipment .....................................................164
A.2 Spares Parts List: Traffic Signalling Equipment ......................................................165
A.3 Spares Parts List: Regulatory Traffic Sign Equipment..............................................165
A.4 Spares Parts List: Signal Mounted Equipment........................................................165
A.5 Spares Parts List: Pedestrian Signalling and Demand Equipment ............................166
A.6 Spares Parts List: Replacement Smartloop Items....................................................166
A.7 Spares Parts List: Replacement PCB Module Assemblies .........................................166
A.8 UK Standard Controller Types ..............................................................................167
A.9 Non-UK Standard Types.......................................................................................167
A.10 Optional Parts.....................................................................................................167
A.11 Other Spares.......................................................................................................168
A.12 Controller Fuses..................................................................................................168
Firmware Upgrade Process..........................................................................170
B.1 Updating CPU Card Firmware...............................................................................170
B.2 Updating GSPI Peripheral Firmware (Not Including CIC).........................................172
B.3 Updating Remote Node Peripheral Firmware (RAG, Wait Indicator, PDU, Nearside
Indicator, Smartloop) and CIC Firmware ...............................................................175

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1 INTRODUCTION
Purpose
The purpose of this handbook is to describe the procedures for the Installation and Commissioning
of the ST950 Plus+system and to provide guidance on routine maintenance and fault finding.
This handbook has been created in accordance with the requirements of BS EN 12675:2001 and
BS 7987:2001.
Equipment Detail
Ongoing development means that some of the delivered items may differ in detail from the photographs
included in this handbook.
Contact Us
If you have any comments on this handbook, or need any further information, you can contact us
at [e-mail].
Reference Documents
1.3.1 Controller (Essential)
Publisher
Reference Number
Document Title
ITS
667/HB/46000/001
ST950 Facilities Handbook for ST950
ITS
667/HB/46000/003
MOVA 7 HANDBOOK - ST950
ITS
667/HB/46000/004
UTMC OTU Handbook for ST950 And Stratos Outstation
ITS
667/SU/46000/000
Use of ST950 Firmware and Hardware Configurations
ITS
667/HB/46000/000
ST950 Family General Handbook
ITS
667/HH/46000/000
ST950 Family Handset Handbook
ITS
667/HU/46000/000
ST950 User Interface Handbook
ITS
667/GA/53000/ETC
Plus+Top Level General Assembly
ITS
667/DZ/53000/000
ST950 Plus+Family Tree
1.3.2 Intersection Design
Publisher
Reference Number
Document Title
ITS
667/HQ/53000/200
ST950 Plus+Layout Design Tool Quick Start Guide
ITS
667/HE/31699/000
Loop Inductance and Turns Calculation Spreadsheet
ITS
667/HB/20168/000
IC4 Configurator Handbook

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1.3.3 Installation and Commissioning
Publisher
Reference Number
Document Title
ITS
667/HQ/53000/300
ST950 Plus+Installation App Quick Start Guide
ITS
667/HE/20662/000
Installation & Commissioning –Signals & Poles
ITS
667/HB/30000/000
Helios General Handbook
ITS
667/HB/31900/000
Heimdall Above Ground User Manual
ITS
667/HB/45200/000
SLD4 Loop Detector Handbook
ITS
667/HE/20663/000
Loop Detector and Cable Terminations –Installation and
Commissioning
ITS
667/HE/20664/000
Installation and Commissioning Handbook - Installation
Testing (General)
Pre-Requisites
Anyone undertaking installation, commissioning and first line maintenance on the ST950 family
of controllers will also need the ST950 User Interface Handbook (667/HU/46000/000) which
provides details of how to connect to the controller and the different user interfaces which are
available.
1.4.1 Qualifications
Only skilled or instructed personnel with relevant technical knowledge and experience, who are
also familiar with the safety procedures required when dealing with modern electrical/electronic
equipment, are to be allowed to use and/or work on the equipment. All work shall be performed
in accordance with the Electricity at Work Regulations 1989 or the relevant local, state and
government regulations.
Any personnel working on the ST950 family of controllers should have completed the following
training courses
2
:
•HA Sector Scheme Sector 8 Modules 5XX
•M609 –Junction Traffic Controller Maintenance for ST950 / ST950 Plus+
2
Training Requirements for non-UK users may be different

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1.4.2 Required Tools
In addition to a standard Engineer’s tool kit, the following tools are required when carrying out
any work on the ST950 family of controllers.
User Interface
One of the following is required depending on the user interface chosen to be used during the
installation.
Description
Part Number
Compatible browser + USB cable (A to B)
Compatible terminal emulator + USB cable (A
to B)
Netbook kit + USB cable (A to B)
667/1/32380/000
Android Tablet + Wi-Fi Dongle
Serial handset Techterm + RS232 cable
667/4/13296/001
Old Oyster handset + RS232 cable
667/4/13296/000
Larger Screened Oyster handset + RS232 cable
667/4/13296/002
1.4.3 Cabinet Access
One or more of the following will be required to gain access to the controller cabinet.
Description
Part Number
T-bar key
667/2/20234/000
S-18 key –Main Cabinet3
4/MC 289
Manual Panel key Type 900
667/4/13651/000
1.4.4 Spares
Please reference Appendix A for a full list of spares that are necessary when carrying out a site
visit to the controller, whether for installation, commissioning or maintenance.
3
In some areas customers’specified keys may be used

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Definitions
Item
Definition
Bit
Binary digit (i.e. `0’ or `1’)
Byte
Eight bit data array (i.e. bits 0-7, and 8-15 are bytes)
EM
Controller identification number (ElectroMatic).
CIC
Configuration Identity Code (equivalent to EM above)
GVP
Generic Versatile Platform - used by ST950 and other Siemens products to
provide general services such as comms, user interface, etc.
STS
(Site to Scale)
A scale drawing of the intersection including controller position, detector loop
positions and specification, cable routing and poles with signal head
arrangements.
Word
Two-byte data array (i.e. bits 0-15 constitutes a data word)
Works Specification
Document produced by Siemens, which details the hardware required for the
controller and includes Site Data, usually in the form of a printout of the data
entered on the configurator.
Abbreviations
Abbreviation
Meaning
AC
Alternating Current
BCD
Binary Coded Decimal
CET
Central Earth Terminal
CLF
Cableless Linking Facility
CIC
Controller Interface Card
CLU
Cableless Linking Unit
CPU
Central Processing Unit
CRC
Cyclic Redundancy Code
CRL
Certificate Revocation List
CTB
Controller Terminal Backplane
DC
Direct Current
DFM
Detector Fault Monitor
DHCP
Dynamic Host Configuration Protocol
DNS
Domain Name System
ELV
Extra Low Voltage
GSPI
Generic Serial Peripheral Interface
HI
High Intensity
HFF
Hardware Fail Flash (ST950 LV/ELV Only)

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Abbreviation
Meaning
HTTP
Hypertext Transfer Protocol
HTTPS
HTTP Secure
IC4
Intersection Configurator v.4 (UK controller configuration application)
IDB
Intelligent Detector Backplane
I/O
Input/Output
ITS
Intelligent Traffic Systems
KOP
Kit of Parts
LED
Light Emitting Diode
LMU
Lamp Monitoring Unit
LPU
Logic Power Unit
LSLS
Lamp Switch Low-Voltage Serial
NTP
Network Time Protocol
OCSP
Online Certificate Status Protocol
OTU
Outstation Transmission Unit
OSS
Outstation Support Server (may be stand-alone or part of Stratos)
PCB
Printed Circuit Board
PDU
Pedestrian Demand Unit
PI
Periodic Inspection
PROM
Programmable Read Only Memory
RAG
Red Amber Green
RAM
Random Access Memory
RCD
Residual Current Device
rms
Root Mean Square
RMS
Remote Monitoring System
RTC
Real Time Clock
SA
Speed Assessment
SDE
Speed Discrimination Equipment
SEB
Sealing and Earth Bar
SSH
Secure Shell
TCP
Transmission Control Protocol
TLS
Transport Layer Security
UDP
User Datagram Protocol
UTC
Urban Traffic Control

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Abbreviation
Meaning
VA
Vehicle Actuated
Third Party Information
Embedded in this product are free software files that you may copy, distribute and/or modify
under the terms of their respective licenses, such as the GNU General Public License, the GNU
Lesser General Public License, the modified BSD license and the MIT license. In the event of
conflicts between Siemens license conditions and the Open Source Software license conditions,
the Open Source Software conditions shall prevail with respect to the Open Source Software
portions of the software.
On written request within three years from the date of product purchase and against payment of
our expenses we will supply source code in line with the terms of the applicable license. For this,
please contact us at:
Open Source Clearing
Product Development
Intelligent Traffic Systems
Siemens Mobility Limited
Sopers Lane
Poole
Dorset
BH17 7ER
UK
Generally, these embedded free software files are distributed in the hope that they will be useful,
but WITHOUT ANY WARRANTY, without even implied warranty such as for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE, and without liability for any Siemens entity other than as
explicitly documented in your purchase contract.
Open source software components used within the product are listed on the controller's web and
mass storage device interfaces.
Trademarks
The following terms used in this document are trademarks of their respective owners:
•Android is a trademark of Google Inc.
•Linux is the registered trademark of Linus Torvalds in the U.S. and other countries.
•SD is a trademark of SD-3C, LLC in the United States, other countries or both.
•USB is a trademark of USB Implementers Forum, Inc.
•Windows is a registered trademark of Microsoft Corporation in the United States and other
countries.

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2 PLUS+INTRODUCTION AND BASIC PRINCIPLES
The Siemens ST950 Plus+system is part of the wider ST950 family of controllers and associated
equipment. The ST950 Plus+system will run very similar firmware and offers same facilities as the
rest of the ST950 family, including license enabled integral MOVA8 and integral UTMC OTU
facilities.
The ST950 Plus+Controller is supplied as a single-door outer case with a 6U logic rack and
equipment mounting frame.
Figure 1 : Comparison of Traffic Cabling Methodologies
The Plus+Traffic Controller provides ELV Power and communications, using a four-core armoured
cable, to a number of intelligent Plus+Nodes on the street. The cable connects at the cabinet to a
‘Cabinet Interface Card’ (CIC) via its ‘Cable Termination Backplane’ (CTB).
Each CIC supports a number of on-street cables (arms or rings) each with individual electronically
controlled power switch off capabilities.

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Figure 2 –System Overview
On the street, the armoured street cables terminate at a “Pole Top Board” (PTB) within the Traffic
Signal Pole, located inside the Pole Cap. An option for mid-level or low-level access poles is also
available (using a 16-way protected terminal block assembly, 667/1/58200/026).
From the terminations in the pole, a more flexible non-armoured cable (also known as the Plus+
Dropper cable) then extends the power and communications to the Plus+Nodes, housed in
arrange of signal enclosures attached to the pole.
The Plus+ Nodes provide distributed signal control and monitoring functions as well as loop
detection (Smartloop).
The Plus+ Nodes provide an interface for the use of direct connection for a range of appropriate
detection devices (e.g. Vehicle Actuation, push buttons, solar cell), thus avoiding the need for
additional cabling routed back to the controller cabinet.
Where Plus+Nodes have a safety function (Signal Heads, Nearside Display Units, Pedestrian
Demand Units and Wait Indicators), they are designed to be inherently safe to prevent situations
that could endanger traffic or pedestrians in the event of communications disruption or internal
component failure. The Nodes are designed so that they cannot give a false ‘proceed’ indication
under fault conditions.
Specifically, these safety Traffic Signal Nodes are named the ‘RAG Node’ (Signal Heads and Farside
Pedestrian Signals), ‘Nearside Node’ (Nearside Display enclosure) and ‘Wait/PDU Node’ (Pedestrian
Demand Unit and Wait Indicator enclosure), according to their installation location and function.

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Plus+ System Components: An Overview
2.1.1 ST950 CPU Card
The CPU Card performs all high-level control functions for the junction and communicates with
the peripheral I/O cards and CIC cards using high speed serial communication protocols. The
physical interfaces are the same as those used in the existing ST950 family of controllers.
The ST950 family use an updated I/O card protocol which improves system performance and adds
functionality. This protocol is known as GSPI - Generic Serial Peripheral Interface. Typically, the
need to use I/O cards in a Plus+system is much reduced because most I/O functionality is
performed by the Nodes directly. However, where I/O cards are required these may be fitted in
the cabinet. ST950 compatible I/O cards are easily recognized by the text 'I/O CARD
667/1/32990/95x' printed on the board cover.
Reference Section 3.12 and 3.13 for further information.
2.1.2 CIC (Cabinet Interface Card) and CTB (Cabinet Termination Board)
The Plus+Cabinet Interface Card (CIC), along with its associated Cabinet Termination Backplane
(CTB), provides for connection and communications to the remote street equipment. It also
provides for the control and monitoring of system power.
The CIC interfaces with, and is ultimately controlled by, the ST950 CPU PCB.
The CIC, fitted to its associated CTB, is situated within the controller cabinet in a similar fashion to
how the ST950 ELV controller mounts its Lamp Switch Card assemblies and are typically mounted
on the side walls of the controller.
Up to three CICs may be fitted in the controller cabinet. For complex installations requiring a large
number of street terminations an additional cabinet may be deployed, housing a maximum of
three additional CICs.
Street wiring is terminated directly to the CTB via cage clamp terminal blocks. The CTB in turn
routes its connected signals to the CIC via DIN standard connectors.
The CIC is fitted with a metallic cover to provide a degree of protection from accidental contact.
However, there are no hazardous voltages present on the PCB.
Key Features:
•Provision for 3-off rings or 6 arms
•Input for up to 3-off 48V DC Power supplies
•48V PSU monitoring inputs
•Relays for isolation of the 48V supply to the 3 rings/arms
•Relay monitoring for functional test and Power bank overcurrent
•Mosfets for the disconnection of the 48V supply to the 12 passive safety arms (not currently
used)
•GSPI and SPB bus interfaces
•I2C interface for Aspect Mimics
•Zero crossing interface

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•CPUA and CPUB microprocessors
•EEPROM / FRAM for inventory, identification and fault information
•Lightning protection for the RS485 ring/arm interfaces
•Diagnostic LEDs
Reference section 3.16 for further information.
2.1.3 Nodes and Bypass Module
An example of a Node is the RAG Node. This is typically fitted inside the green aspect of the Helios
signal. It operates as a fail-safe unit which ensures that the LED signals are guaranteed to be off
in the event of any malfunction.
Figure 3 : Bypass Module and RAG Node

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The RAG Node is provided with a cover to give some mechanical protection and has several status
LEDs. which indicate the operational status of the Node. The RAG Node PCB is conformally coated
to provide additional protection and improve reliability.
A Bypass Module is included which plugs into the RAG Node. The Bypass Module allows for the
continuation of the Plus+communications and operation even if a RAG node has been
disconnected (PL4) for example in the case of a ‘hot’swap. The Bypass Module also provides
addressing functions in order to assist the controller in the management of Nodes.
Controller Monitoring
The controller monitors the status of all nodes and if any phase loses all signals (equivalent to
the failure of an aspect drive in a conventional controller), the controller will register a
compliance failure and extinguish all signals on controller, or the affected stream if configured.
Impact of Bypass Removal
The bypass module must NOT be removed and/or swapped from a RAG assembly without
consulting the Technical Support team in the first instance.
The RAG Node provides:
•Drive and monitoring circuits for up to 4 Plus+LED signals (Red, Amber, Green and a
separate green arrow),
•Drive and monitoring circuits for up to 2 Plus+Regulatory Signs,
•An above ground detector power supply providing 24V DV (@0.5A),
•Four TOPAS 2523 compliant digital inputs with an additional one which is configured to
be used as a solar cell input.
Two TOPAS 2523 compliant digital outputs which may be used for linking or other similar
functions.
Reference section 4.2 for more details.
48V is Not Lamp Supply
The 48V supplies to the Nodes may remain on even if fault conditions require the Signals to be
switched OFF. The 48V supply that is distributed through the network is not considered a 'Lamp
Supply' and this is a fundamental difference between Plus+ and 'conventional' traffic controllers.
The Nodes guarantee the signals are off as requested, even though there is 48V to the Nodes.

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2.1.4 Smartloop Modules
The Smartloop unit is a combination of a node and an SLD4.
The combination of these devices, developed as a single PCB, is housed in a plastic enclosure and
then fully potted. The Smartloop device can then be connected to the Plus+ network and provide
an interface for inductive traffic detection loops. This implementation continues the principle of
minimising the amount of street cables routed back to the controller.
The Smartloop provides:
•Connections for up to four inductive loops.
•Permanently active LED indicator of detection state
•Connections to allow further Smartloops to be connected downstream.
•Bluetooth interface for configuration.
Note that:
•Both loops of an SDE/SA or U/D pair must be assigned to the same Smartloop device.
•N+1 count inputs are not currently supported by Smartloop and must continue to use
standard loop detector cards (e.g. SLD4).
The Principles of Plus+Wiring
2.2.1 Voltage Drop in Plus+ Network
The IET regulations have defined values for voltage drop within a network to ensure that any
equipment connected to that network is maintained within its likely operating range. Within a
traffic control signals network the rule of thumb of 4% does not necessarily apply directly, as
signals have their own operating range and requirements. The applicable design and maintenance
limits are defined in our design and equipment handbooks for our signals, (Note signals supplied
by third parties may have different operating characteristics and ranges and the design and
maintenance limits for those should be obtained from the OEM).
For Plus+ the complex design calculations have been built into our Plus+ junction layout design
tool. The equipment will then inform users / maintainers if the supply as seen at any pole / node
is outside to the normal operating range for a period.
2.2.2 Wiring
The Plus+system elements are wired up by a collection of 4-way street cables (armoured) and 6-
way (dropper) cables. The diagram below outlines the principles behind the wiring particularly
with regards to cable types and colours.

ST950 Plus+ User Manual
ST950 Plus+ User Manual
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Unrestricted
CIC/CTB
Pole Top
Termination
Board
Bypass/RAG
Node
Pole Top
Termination
Board
Bypass/RAG
Node
Pole Top
Termination
Board
Bypass/Nearside
Bypass/PDU
Smartloop
D+
D-
+48VDC
0V
Street Cable
D+
D-
+48VDC
0V
Dropper Cable
D+ (back to pole top)
D- (back to pole top)
Spur
Spur
Dropper Dropper
Street Cable (Return to make Ring)
Bypass/PDU
(Stubby)
Figure 4 : Principles of Plus+Wiring
The ‘street’ cable is a 2-pair armoured cable. Red and Blue as designated for supply(+48VDC) and
the Yellow and Black are data connections (D+ and D-) respectively.
Connections between the pole top and nodes (RAG or Ped devices) use a six-way dropper cable.
Colour designation is as above with the additional Orange and White (D+ and D- respectively) used
to maintain a data loop from nodes back to the Pole Top Board.
2.2.3 Stub Pole Wiring
The same principles also apply for the Stub Pole. This is treated much like a normal pole whereas
the difference will be that there is no Pole Top Board (PTB). Rather, the street cables are terminated
at the Pedestrian Equipment terminal block and the armouring are terminated using two CT
glands, within the stub pole. There will be an earth link between the two CT glands and a second
earth link that is either terminated on the pole earth stud or then passed through to the Pedestrian
Demand Equipment.