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GE 8125-DI-DC 32-channel DI, non-isolated, module-powered

From:ABB | Author:Wang | Time :2025-01-09 | 358 visit: | 🔊 Click to read aloud ❚❚ ▶ | Share:

GE 8125-DI-DC 32-channel DI, non-isolated, module-powered

control gate input and both channel counters
can be started, stopped and reset by BIM
commands. Counters can be configured to
count up (the default) or down. If the quadra ture calculation is enabled (see below) then
the configured counter direction is ignored;
instead counter direction is determined by
the quadrature value (up for forward, down
for reverse).
A counter preset value can be configured
by a BIM command which also resets the
counter. On reaching the preset count value
an event is triggered which can also be
passed to the channel’s digital output. This
state is cleared by resetting the counter or
assigning a new preset value.
Quadrature (rotation direction)
The second channel can be used to determine
direction of rotation by comparing the phase

of its input pulse with that of the first channel.
If the Ch 2 input is in a low state on the rising

edge of the Ch 1 pulse then the rotation is
forward (Fig 1a). If the Ch 2 input is high on the
rising edge of the Ch 1 pulse then the rotation
is backward (Fig 1b).
Filtering
The module has a hardware filter which can
be used to minimise the effects of contact
bounce. The available settings are 1, 5, 20 kHz
and Off.
Alarms
High / Low alarms
High and low alarms can be configured for
each channel. When the input value goes
beyond an alarm limit, channel and module
flags are set, the channel LED flashes and, if
configured, the channel’s digital output state
will change.
Acceleration alarms
An acceleration alarm limit can also be set.
If the limit is exceeded the actions taken are
identical to those for the high/low alarms.
Alarm deadband
A deadband can be specified for the high, low
and acceleration alarms. This provides hyster esis to avoid repetitive alarms in noisy signal
environments.
Missing pulse alarm
Both channels can be configured to detect a
“missing pulse”. If no input pulse is detected
for a defined time period an alarm is signalled
in the same way as the high/low alarms. The
alarm is cleared on receipt of a pulse or on
reconfiguration of the alarm. The time period
is restarted after each sample period in which
at least one pulse occurs.
Line Fault Detect
Each channel can be configured to sense an
open or a short circuit condition on inputs. On
detection, the actions are those for the high/
low alarms. On fault, the node can: report the
frequency value as being at the top or the
bottom of the range, freeze the counter, set
the acceleration to zero; depending on how
the BIM or Controller is configured.
Control data
The host can write data to control each
channel counter. The available parameters
are: start, stop, set, reset and preset value.
Digital outputs
Both digital output channels can reflect the
status of the inputs by indicating:
• Frequency or acceleration alarm
• Counter preset value reached while the
main channel can also output:
• Quadrature forward or reverse signal
• Scaled retransmission (a “divided by N”
version of the input)


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