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GE 8121-DI-DC 16-channel DI, 24Vdc non-isolated

From:ABB | Author:Wang | Time :2025-01-09 | 252 visit: | Share:

Power-up conditions

The module uses the following values when it

powers up.

Module mode

Normal (not “failsafe”)

Active/inactive

All channels power up in the active state.

Alarms

All alarms are made inactive by having their

values set to high or low extremes, as appro priate.

Dead zone

0 (i.e. all changes of A/D data are reported for

an active channel)

Software filtering

Disabled

Channel type

Type K thermocouple or 3-wire RTD - Pt100

O/C sensor

Off

Visual indicators

CHANNEL “STATUS” LED (YELLOW)

On Sensor loop OK

Off Open circuit sensor and channel inactive

Flashing Open circuit sensor and channel active

OR Error condition
GENERAL

The 4–20 mA AO modules use a single D/A

converter in a sample-and-hold configura tion to drive each of the output channels. The

processor sets the current value for each of

the active channels once every 20 ms. Any

requested output values below 1mA are

clamped to 1mA to ensure that the open-loop

detection mechanism is always operable.

To verify that active output channels have

current flowing to the field, the processor

reads a hardware signal every time an output

is written to the D/A converter. If the signal

indicates “no current flowing”, i.e. < 1 mA, for

50 consecutive scans (i.e. one second), an

Open-Loop Detection failure is set for that

channel.

HART® capability

AO modules “with HART” are compatible

with all HART devices of protocol revision

5.0 or later. Each channel can communicate

with a single HART instrument and supports

HART communication with the wide range of

HART valve positioners now available. HART

universal command 3 can be used to gather

up to 4 dynamic HART variables such as

valve position, air pressure, etc., together with

HART status variables. These are scanned by

the BIM or Controller and may be communicated over the LAN for easy integration into

the control system. In addition, HART passthrough may be used for device configuration,

calibration and advanced diagnostics.

Data format

The output data has a resolution of 12 bits

but is stored as a 16-bit unsigned value. In

this range 0 is equivalent to 0mA and 65,535

is equivalent to 25mA.

MODULE OPERATING STATES

Failsafe mode

The module supports failsafe mode as

defined in the earlier I/O module introductory

section. When put in failsafe mode the output

can be made to adopt one of the following

options.

1) Use configured failsafe values

In this (default) mode, the module forces

the output to a predefined percentage

value. The default value is 0%.

2) Hold last value

In this mode the channel holds the last

value it output. When not in failsafe the

module adopts Normal mode.

Channel Active/Inactive

Each channel can be made active or inactive

individually. When a channel is made inactive

the output is disabled, i.e. deenergized.

When a channel is made Active again the

output is driven based upon the current

configuration.

Default/Power-up conditions

The module uses predefined values when

it powers up. The following parameters

summarize the state of the module when it

powers up.

Module mode:

Normal (not “failsafe”)

Active/inactive:

All channels power up in the Inactive state.

Visual indicators

CHANNEL “STATUS” LED (YELLOW)

On Field circuit OK

Off Open circuit field loop and channel

inactive

Flashing Open circuit field loop and channel active

OR Error condition

On the AO modules the yellow “Status”

LED reacts in the following way to module

conditions.

An error condition – i.e. a flashing LED –

could be as the result of the loss of the

HART communications signal.

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