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