The Cpu Card; Controller Microprocessors - Siemens ST950 Handbook

5 T CPU C
HE
The CPU Card holds the controller configuration and performs the function of
configuration, control and management. The same CPU Card is used in the ST950 and
ST950ELV Controllers. The main external data interfaces of the CPU Card are:
Interface to the lamp switch cards
Serial Interfaces (GSPI) to IO Cards and Intelligent Detector Backplanes
Manual Panel
RS232 interface to handset or Gemini
USB interfaces
Ethernet Interface
High level control of features such as MOVA7 and UTMC OTU
5.1

Controller Microprocessors

There are a number of CPUs on the CPU Card within the Traffic Controller, each with a
specific role:
Primary CPU –
PHP CPU –
SEC CPU –
EFC CPU –
Fail Flash
CPU
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Responsible for the safety timings and low-level sequencing of the
traffic signals (e.g. Amber Leaving and Intergreen times) and
monitoring the states of the traffic signals.
Responsible for monitoring the states of the traffic signals as well as
the switching and low-level monitoring of all the Lamp Switch Cards
in an LV Controller. Not used on an ELV Controller.
Responsible for monitoring the state of the traffic signals in an ELV
Controller, and in all controllers, this CPU also monitors the
operation of the Primary CPU.
Powerful CPU running the Linux operating system that provides
interfaces to the outside world and the high-level traffic stage
selection (e.g. Stage 1 is next, MOVA7, UTMC OTU functionality).
Just provides the flash strobe for Fail Flash controllers. The flash
–
period is specified in the IC4 configuration.
Unrestricted
4
Paul Cox
ST950 General Handbook
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
2
Page
Status
Date
Document No.
Mobility is a division of Siemens Plc
66 of 107
Issued
16-Jul-2015
667/HB/46000/000