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

From:ABB | Author:Wang | Time :2025-01-09 | 236 visit: | Share:

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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