Chapter 3
Chapter 3 I/O Modules 3-35
3.5 ADAM-4021 Analog Output Module
Analog output module receives their digital input through an RS-485
interface from the host computer. The format of the data is either engineer-
ing units, twos complement hexadecimal format or percentage of full-scale
range (FSR), depending on the module’s configuration. It then uses its
microprocessor-controlled D/A converter to convert the digital data into
output signals.
You get a true readback of the analog output signal from the unit’s ADC,
which independently monitors the output. You can specify slew rates and
start up currents through the configuration software. The Analog Output
Module can supply single-channel analog output in a range of voltages or
currents.
They protect your equipment from ground loops and power surges by
providing opto-isolation of the D/A output and transformer based isolation
up to 3000 V
DC
.
Slew Rate
The slew rate is defined as the discrepancy between the number of milli-
amps (or Volts) per second of the present and the required output currents
(or voltages). An ADAM analog output module may be configured for a
specific slew rate.
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