Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 165 of 265
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19.1 Introduction
‘Manual Step-on mode’ can be configured instead or in addition to the ‘Manual
mode’ described in section 18.
Manual step-on provides a single ‘step-on’ button rather than a number of individual
‘stage select’ buttons. When the ‘step-on’ button is pressed, the controller moves to
the next stage in a pre-defined sequence.
Manual step-on also provides an ‘all-red’ button which is normally configured to put
all the signals to their ‘not at right of way’ state, normally red.
A separate ‘manual step-on enable’ button or switch usually enables the mode.
If a Police Manual Step-On Panel is used and located behind the Manual Panel
door, the Manual facility described in section 18 is normally transferred to the
internal Manual Panel as described in section 30.3.
However, since the ‘all-red’, ‘step-on’ and ‘enable’ inputs to the facility are controlled
using special conditioning, they can be configured to use any controller digital
inputs or spare buttons on the normal Manual Panel for example.
Thus, as an alternative to using a separate ‘Manual Step-On Panel’, the controller
can be configured to use the normal intersection Manual Panel (see section 30.1)
for both manual and manual step-on modes. For example, Spare Switch 1 (SW1)
can be configured to enable the facility, Spare Switch 2 (SW2) used to provide the
‘step-on’ button and the normal ‘All-Red’ button used to select the all-red stage.
19.2 Description
When Manual Step-on has been selected, i.e. enabled, the controller will go into
Manual Step-on Mode, subject to the mode priority table.
It is then possible to request a stage change by operation of the ‘step-on’ push
button.
The order in which stages are introduced in Manual Step-on is predefined in
configuration (site data). The ‘step-on’ push button is operated to make the
controller move on to the next designated stage. Having arrived at the next stage
the controller may do one of two things depending on the option selected.
(a) Remain in that stage indefinitely, the controller being ready to respond
to another operation of the ‘step-on’ push button, which if operated will
send the controller to the next predefined stage,
OR