Siemens ST750 Configuration Handbook page 77

These are located on the CPU card PL2 (Phase D) and PL3 (Phase B). Circuit diagram
667/DA/27831/etc details the output signals. Pin 12 is titled 'Audible Phase n Loud' – This is the
normal connections to audible outputs. This output can be configured to be time switched. Pin 13
is titled 'Audible Phase n Quiet' - This output is for the secondary physically muted audible.
Audible and Tactile units used must operate correctly over the voltage range 10 to 24V DC.
The audible units are P/N 667/4/04785/000.
There are four main situations for audible/tactile control that arise on an ST750LV. These are:
1. Normal Audibles – The 'Loud' output is used.
2. Switched Audibles – The 'Loud' output can be used configured to switch off at selected
times (e.g. at night). If the Tactiles are also to be switched then the tactile PSU 'interlock'
input can be connected to this output.
3. A Muted Audible Output – The 'Quiet' output can be connected to the second audible.
This audible will require a local physical muting method.
4. A Pelican With Flashing Green Man – The 'Loud' output is off during the flashing period.
Thus the 'Loud' output is used to connect to the audibles and the tactile PSU 'interlock'
signal input. If the 'Loud' output is configured to be time switched, and then the 'Tactile'
output is used to control the tactile PSU interlock signal input.
Audible and Tactile modules should be ordered separately as they are not included in the
base Outercase, specified in Table 6.
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Nathan Fearnhead
Configuration Control
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667/CC/32750/000
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