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GE 8111-DI-AC 8-channel DI, 115Vac isolated, sinking

From:ABB | Author:Wang | Time :2025-01-09 | 481 visit: | 🔊 Click to read aloud ❚❚ ▶ | Share:

GE 8111-DI-AC 8-channel DI, 115Vac isolated, sinking

General
The 8129-IO-DC Discrete Input/ Output
Module provides the interface to 8 channels,
which may be configured in any combination
of discrete inputs and outputs.
Combined inputs and outputs
Each of the 8 channels of the 8129-IO-DC
Discrete Input/Output Module may be configured, on a channel-by-channel basis, as
either an input or an output.
When configured as an input, the channel
is suitable for use with dry contacts – with
power supplied from the Module.
When configured as an output, the channel is
capable of switching up to 2.0A (maximum of
6.0A continuous per module). Output channels
are used with solenoids, valves and alarms.
Diagnostics
Comprehensive diagnostic tests are
performed on the module and each of its
channels, including tests for stuck ON and
stuck OFF output switches.
Live maintenance
The field wiring connections to the 8129-IO-DC
Discrete I/O Module are classified as nonsparking and can only be worked on in a
Class 1, Division 2 or Zone 2 hazardous area
once the Bussed Field Power connection has
been isolated.
Note: the Bussed Field Power connection
must also be isolated before removing or
replacing the module.
Input configuration
Input channels are used to interface to volt
free contacts. Line fault detection can be
turned OFF or can detect open circuits or
both open and short.
Input filtering
A change in the input state is recorded only
if the states observed at the start and end of
the filter time interval are the same. If they
are different the previous state is maintained.
(This reduces the chance of noise being incorrectly interpreted as a change of input value).
The filter time interval can be configured
between 0 and 8s, in 1ms intervals.
Input transition counting
A counter can record the number of filtered
transitions of a particular type. Depending
on the polarity setting, the counter will either
count transitions from 0 to 1, or from 1 to 0.
The counter “wraps around” from 65 535 to
zero without indication.
Transitions are counted even if the channel is
configured to “latching”.
Earth leakage detection
Where earth leakage fault detection is
required, a single channel of an 8129-IO-DC
module must be configured to monitor earth
leakage and wired to the appropriate terminals of an 8751-CA-NS Controller Carrier.
Input latching
Inputs can be configured to “latch” a particular (filtered) input transition and maintain
the output in the latched state until the latch
is cleared. “Normal Polarity” will latch a transition from 0 to 1 as 1, “Inverse Polarity” will
latch a transition 1 to 0 as 0. The operation is
described in figure 1.
Normally energized and normally
de-energized outputs
Individual output channels can be either
normally energized or de-energized. 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 energized 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 de-energized by the fault.

For normally de-energized outputs, if a single
switch fails short circuit, the other switch can
energise the load. If either fails open circuit,
the load cannot be energized.
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.
Input channel line fault 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.
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