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RDU Mk2 Installation & Programming Manual Document No: LT0499
Programming Part 1
Page 6-26 8 April 2015 Issue 1.02
6.4.4.3.1 Pass-on/ Follow/ Local Options for Warning System isolate/ External Bell
Isolate (AS4428.1 mode)
For each of Warning System isolate and External Bell isolate there are three parameters
which may be enabled/disabled at the RDU - pass-on, follow, and local. The following
description applies to both the Warning System and External Bell but they each have an
independent set of pass-on/ follow/ local parameters and behaviour.
Australian mode
1.
Pass-on.
If "pass-on" is enabled then the RDU can send isolate/ de-isolate commands to the
FIP for the Warning System/ External Bell. "Follow FIP" is enabled automatically so
the isolate LED (Warning System or External Bell) at the RDU indicates the FIP
state.
2. Follow and local.
With pass-on disabled, any combination of "follow" and "local" may be programmed
except that a non-MAF RDU may not have local enabled. The RDU receives the
isolate status from the FIP and also stores its own local isolate status which it may
control if it is programmed with "local" enabled.
Follow and local both enabled.
With both follow and local enabled the RDU outputs (e.g. relay) and LED are isolated
if either the FIP is isolated or if locally isolated at the RDU. The Warning System
isolate/ External Bell isolate keys affect the local isolate status and do not affect the
FIP status.
Follow enabled and local disabled.
With follow enabled and local disabled the Warning System isolate/ External Bell
isolate keys at the RDU do nothing.
Follow disabled and local enabled.
With follow disabled and local enabled the RDU ignores the FIP isolate status. The
Warning System isolate/ External Bell isolate keys affect the local isolate status and
do not affect the FIP status.
New Zealand mode
New Zealand operation is the same as Australian operation described above except that
there is a Silence Alarms keyswitch involved. The Silence Alarms keyswitch is always
associated with the Warning System and not the External Bell. The pass-on/ follow/ local
parameters for the Warning System also determine how Silence Alarms is treated. If "pass-
on" is true/enabled for Warning System isolate then the state of the Silence Alarms
keyswitch at the RDU is sent to the FIP. If "local" is true then the Silence Alarms keyswitch
at the RDU can be used to silence the Warning System at the RDU.
6.4.4.3.2 Pass-on/ Follow/ Local Options for Warning System Operate (AS4428.1
Mode)
Only the "follow" parameter is meaningful - the pass-on and local parameter settings are not
used for anything. If the "follow" parameter is set true then (for a MAF RDU), the Warning
System at the RDU will be activated (if not isolated) when the Warning System at the FIP is
activated. This requires an AS4428.1 type of FIP.