Specifications
ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 237 of 265
3
3
6
6
M
M
O
O
V
V
A
A
(
(
M
M
I
I
C
C
R
R
O
O
P
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R
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S
S
S
O
O
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R
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P
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M
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D
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36.1 Introduction
MOVA is implemented by a separate unit, which monitors the movement of vehicles
through an intersection and then adjusts the operation of the controller to optimise
its flow.
If using a Siemens Gemini
2
MOVA
unit, also see the Gemini
2
Handbook, part
number 667/HB/38001/000.
A 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 ST900 and Siemens MOVA unit use a serial link, known as
‘Serial MOVA’ and an ‘ST900 Semi-Integral MOVA unit’, see section 36.3.
36.2 Instructions for Connecting MOVA to Traffic Controllers
1. Stage Green confirms and, where required, phase green confirms will be
open circuit during green. They will be short circuit at other times except as
detailed in item 3.
2. Controller ready bit will be short circuit during normal operation, except as
detailed in item 3, and open circuit when manual control (or any other higher
priority mode) is operational.
3. Stage green confirm 1 and 2 and controller ready bit will all be open circuit
during the following conditions:
a) Manual Control
b) Selected Fixed Time if available
c) Selected VA time if available
d) Signals off (switched off manually or due to a Fault)
4. Force bits closed contact provides the force signal.
5. An output is usually required for each pedestrian phase, which should be
closed when the wait indicator is illuminated. These are passed to the MOVA
unit as the detector inputs for those phases (MOVA ‘Links’).
36.3 ST900 Semi-Integral MOVA / Serial MOVA
The Siemens Gemini
2
MOVA unit can be connected via a serial link to an ST900
traffic controller to provide the ‘ST900 Semi-Integral MOVA’.
The serial link uses the existing physical handset link between the OMU and the
controller. This serial link has been enhanced to provide a high-speed data link
between the Siemens ST900 controller and the Siemens Gemini
2
unit, which allows