Self-Test Facility; Mova (Microprocessor Optimised Vehicle Actuation) - Siemens ST950 Handbook

The hardware fail flasher can also be initiated by special conditioning, however normal
operation can only be re-instated by operator intervention (i.e. RFL=1 and power
off/on). Note that the part-time state can be configured to flash the signals and this can
be initiated and removed by special conditioning without operator intervention.
When Hardware Fail Flash is selected, the Lamp Supply to the Red and Amber outputs
remains present in Failure Mode / Shutdown so that selected signals can flash. As this
is a Failure Mode state, control of the lamp supply to the flashing signals is relinquished
by the controller firmware and the firmware can take no further actions. Since the
controller cannot take any further actions, Hardware fail flash could be vulnerable to
undesirable fault conditions which cannot be prevented by the controller. With the
availability of lamp supply to the Red and Amber outputs during Failure Mode this does
allow some undesirable signal states to exist which must be accepted by the customer,
such as Red or Amber stuck on, or a Green flashing that is shorted to a Flashing
Amber. Specific details for LV and ELV controllers can be found in the section on
Hardware Fail Flash in the Facilities Handbook.
36 S -T
ELF EST
Self-Test checks as much of the hardware as possible without the controller requiring a
configuration. It is a completely separate function provided by the firmware with faults
displayed on the handset directly. When the power is switched off and back on again
after the Self-Test, the normal operation of the traffic controller is not affected in any
way and continues as though nothing has happened.
For more information, refer to the Installation handbook for the controller.
37 MOVA (M
The MOVA algorithm monitors the movement of vehicles through an intersection and
then adjusts the operation of the controller to optimise its flow.
The ST950 includes the MOVA algorithm and a dedicated MOVA mode, completely
separating it from the OTU functionality and UTC mode. Up to four MOVA 'kernels'
(instances of the MOVA application) can be enabled with the appropriate licenses, with
each MOVA 'kernel' controlling and monitoring one stream of the traffic controller.
The ST950 also continues to support an external MOVA unit. If using a Siemens
Gemini2 MOVA unit, also see the Gemini2 Handbook, part number 667/HB/38001/000.
An external MOVA unit uses the controller's UTC interface, which allows it to influence
the operation of the controller. This can use the controller's physical inputs and outputs;
however a Siemens MOVA unit can also uses serial link, known as 'Serial MOVA' and
an 'Semi-Integral MOVA unit'.
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Paul Cox
ST950 General Handbook
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
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667/HB/46000/000