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GE 8104-AO-IP 8-channel AO, 4-20mA

From:ABB | Author:Wang | Time :2025-01-09 | 213 visit: | Share:

Channel Active / Inactive

Each channel can be made active or inactive

individually.

When a channel is made inactive the output

is turned OFF (i.e. de-energized). When a

channel changes from inactive to active the

following situations apply:

a) If channel is in Static mode of opera tion: It becomes a latched output and

will remain so until reconfigured.

b) If channel is in Dynamic mode of

operation: The channel will resume

operation with its previous configura tion and output.

Visual indicators

On Channel input “high” or latched

Off Channel input “low”

Flashing Line fault detect (2/1 only)

On the DO modules the yellow “Status” LED

reacts in the following way to module conditions.

NOTE: The LED may appear to flash when the input goes

high and low repeatedly.

Power-up conditions

On power-up, or if a reset is executed, the

configuration will automatically adopt

predefined states:

Module mode:

Normal (not failsafe)

Channel types

All channels are configured as Discrete outputs

Active/Inactive

All channels power-up in the Inactive state

Line fault detection (2/1 only)

Disabled on all channels

GENERAL

These modules are designed to meet

the requirements of a very wide range of

mechanical positioning and flow applications.

When used separately, the two input channels

will accept pulse inputs to measure:

• Frequency

• Acceleration / rate

• Number of pulses (i.e. counter)

When combined, they provide:

• Rotational position and direction data from

quadrature encoding devices. In addition,

the module has two digital outputs and one

digital input to gate (start/stop) the channel

1 internal counter.

Pulse inputs

Pulse inputs can come from a range of

sensors having different amplitudes, trigger

levels and input impedance requirements.

Inputs types accepted are:

• Proximity detectors (NAMUR/DIN19234)

• Current inputs

• Voltage inputs

• Switch / electro-mechanical inputs

Threshold levels for the current and voltage

input can be set to suit the application.

Dynamic data

Several values are calculated, for each

channel, from the signal pulses received.

Frequency

This is calculated by measuring the time

interval between pulses. An average is calculated over a period (20 ms to 200 s) defined by

the user. The time interval is measured from

the edge of one pulse to the same edge of the

next pulse. The polarity (rising or falling edge)

can be configured.

The default is the rising edge. There are ten

frequency measurement ranges. They start

at 0 – 100 Hz and rise in ratios of 3, 5 and

10. However, the maximum frequency of the

module is 50kHz, so any values in the 100 kHz

range that exceed this should be considered

as “out-of-range”.

Acceleration

This is calculated from the difference in

frequency from the start to the end of the

sample period. A positive value indicates an

increase in the rate of frequency and a negative value is a decrease in the rate.

Counting

Each channel has a 32-bit counter that

indicates the total number of input pulses

since the counter was reset. The counter on

Channel 1 can be started and stopped by the

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