GE 8082-FC-30 16-pin cable for 8618 (3m)
Normally energised andnormally de-energised
outputs
Individual output channels can be either
normally energised or de-energised.
Each output channel comprises 2 switches
that operate in series with the load – one on
the supply line, the other on the return
For normally energised outputs, if a single
switch fails short circuit, the other switch can
still de-energise the load. If either fails open
circuit, the load will be immediately deenergised by the fault.
For normally de-energised outputs, if a
single switch fails short circuit, the other
switch can energise the load. If either fails
open circuit, the load cannot be energised.
Switches are tested by pulsing them ON or
OFF for a maximum of 5 ms – the load must
not respond to this length of pulse. This test
can be disabled if required.
Short circuit protection
Channels that are configured as outputs and
which are short-circuited are protected by
over-temperature thermal detection. If an
output channel is short-circuited it will briefly
conduct an over specification current, but
this will be identified by the thermal
detection and the relevant channel made
inactive.
Pulsed output
Output channels can be configured to give a
pulsed output – of either single static, single
dynamic, continuous or continuous dynamic
form.
The single static pulse is ON for a predetermined time. It then remains OFF until a
new pulse instruction is received.
The single dynamic pulse is ON for a period
that may be changed by the application,
then remains OFF until a new instruction to
write is received.
In continuous pulse mode a series of pulses
of defined ON period are sent, with a
defined OFF period between.
Continuous dynamic pulse mode allows the
application to continually vary the ON and
OFF times of the pulse train.
For all types of Pulsed Output, the ON time
of the pulse may be between 0 and 60s in
1ms intervals.
For the continuous pulse mode, the OFF
period can be set between 0 and 60s, in
1ms intervals.
Pre-configured output
patterns
A number of different, pre-defined output
patterns are available, which can be used to
indicate the occurrence of different events,
using the same alarm hardware. The
patterns comply with the requirements of
NFPA 72 and are shown in figure 2

detection
Line fault detection (LFD) for open and short
circuit line faults will normally be enabled
for safety related input channels. Series
resistors are required for short circuit
detection and end of line resistors for open
circuit detection, as shown in figure 3.
The nominal resistance thresholds employed
are shown in the table below.
Output channel line fault
detection
Line fault detection (LFD) for open and/or
short circuit line faults can optionally be
enabled for normally de-energised outputs.
(Normally energised loads would be de energised by either open or short circuit line
faults, of these only short circuit faults will be
detected and reported by the IO Module).
An open circuit fault will be reported for line
resistances above 30kΩ.
Short circuit line fault detection can be
enabled with forward or reverse biased test
currents. With forward biased test currents,
the threshold at which a short circuit fault is
reported is configurable up to 1kΩ. With
reverse biased test currents, the threshold is
fixed at 1.95kΩ.
LED’s
For the operation of the Power and
Fault LED’s see IO Module Overview.
Module ‘Channel’ LED’s
(yellow)
On – Input or output ON
Off – Input or output OFF
SafetyNet Discrete Input/Output Module
8811-IO-DC
Series
3.3kΩΩ End of
line
10kΩΩ
Figure 3 - LFD resistor values
Resistance Value
Open circuit >30kΩΩ
Open contact >6.5kΩΩ
Closed contact <6.5kΩΩ
Short circuit <1.95kΩΩ