F-Link Mk4 Supervised Transceiver System
Ref: FLNK4red
Page 15 of 23
Issue 1
Zone inputs
Each F-Link has four volt-free zone inputs, which can each be
configured as ‘Normally Open’ (default) or ‘Normally Closed’ using
the configuration software. If the input is set as Normally Open (N/O)
then linking the input terminal to the 0v terminal will trigger the
input. If the input is set as Normally Closed (N/C) then removing a
link between the input terminal and the 0v terminal will trigger the
input.
When a zone input is triggered on any F-Link, the corresponding relay output will trigger on all other F-Links on
the network (but not on the originating F-Link). The relevant text will be displayed on all units, unless the zone
is set to “class change” mode (see page 8).
3.2.2
FP link input
Each F-Link has a volt-free “FP-link” monitored input. This input is primarily designed to be used to monitor the
cabling to/from connected equipment, but can also be used to monitor external fault conditions, e.g. a power
supply fault relay. This input has a normal ‘end-of-line’ resistance value of 680 ohms, and is triggered by
removing the resistance (i.e. open circuit), or by linking the input terminals together (i.e. short circuit). This
input is volt-free and can be triggered by dry contact only – do not apply voltage to this or any other control
input.
When the FP-link fault input is triggered on a Node, the Link Fail fault relay will trigger on the Master and the
originating Node only. The corresponding fault message will be displayed on the Master and originating Node
only.
3.2.3
Reset input
Each F-Link has an external reset input, which is connected to the integral key-switch. If required, this input can
be connected to an external volt-free normally-open contact to allow remote reset. The external contact can
either be connected in place of the keyswitch (disabling the local key reset function) or wired in parallel to it (so
the F-Link can be reset either remotely or using the key). See page 20 for details of the reset function. This
input is volt-free and can be triggered by dry contact only – do not apply voltage to this or any other control
input.
3.2.4
Zone outputs
Each F-Link has four zone output relays which will switch over when the corresponding input is triggered on
another F-Link unit. The output relay will switch back in accordance with its mode setting – either when the
input clears (follow), after a set time (momentary), or when manually reset (latched). The text associated with
the zone and originating F-Link will be displayed on the screen (unless the zone is set to “class change” mode).
These settings are changed using the
configuration software. For more information
about relay output modes, see 2.3.3 on page
8. Each relay output is capable of switching a
maximum voltage of 50V (AC or DC) at a
maximum current of 0.5A.
3.2.5
Link Fail output
Each F-Link has a “Link Fail” fault relay output, which should be used to signal to the connected equipment that
there is a problem with the F-Link network. The Link Fail output will be active during the following conditions,
and will automatically clear when the situation resolves:
Loss of radio communication
Test mode active
FP-Link fault input triggered
Individual Nodes will only switch their Link Fail relay for conditions relating to themselves or the Master. The
Master will switch its Link Fail relay for conditions relating to itself or any Node.
The Link Fail relay is capable of switching a maximum voltage of 50V (AC or DC) at a maximum current of 0.5A.
All inputs are volt-free.
DO NOT
apply voltage to any input
(other
than the power supply connection)
because this will cause irrevocable
damage not covered by warranty.
Each relay output is capable of switching a maximum
voltage of 50V (AC or DC) at a maximum current of 0.5A.
DO NOT use these relays to directly switch voltages in
excess of 50V
because this is hazardous and will cause
damage not covered by warranty.