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Publication 1769-UM005A-EN-P
Glossary
The following terms and abbreviations are used throughout this manual.
For definitions of terms not listed here refer to
Allen-Bradley’s Industrial
Automation Glossary
, Publication AG-7.1
.
A/D Converter
– Refers to the analog to digital converter inherent to the
module. The converter produces a digital value whose magnitude is
proportional to the magnitude of an analog input signal.
attenuation
– The reduction in the magnitude of a signal as it passes
through a system.
bus connector
– A 16-pin male and female connector that provides
electrical interconnection between the modules.
channel
– Refers to input interfaces available on the module’s terminal
block. Each channel is configured for connection to a thermocouple or
millivolt input device, and has its own data and diagnostic status words.
channel update time
– The time required for the module to sample and
convert the input signals of one enabled input channel and update the
channel data word.
common mode rejection
– For analog inputs, the maximum level to
which a common mode input voltage appears in the numerical value read
by the processor, expressed in dB.
common mode rejection ratio (CMMR)
– The ratio of a device’s
differential voltage gain to common mode voltage gain. Expressed in dB,
CMRR is a comparative measure of a device’s ability to reject interference
caused by a voltage common to its input terminals relative to ground.
CMRR=20 Log
10 (V1/V2)
common mode voltage
– The voltage difference between the negative
terminal and analog common during normal differential operation.
common mode voltage range
– The largest voltage difference allowed
between either the positive or negative terminal and analog common
during normal differential operation.
configuration word
– Word containing the channel configuration
information needed by the module to configure and operate each
channel.
cut-off frequency
– The frequency at which the input signal is
attenuated 3 dB by a digital filter. Frequency components of the input
signal that are below the cut-off frequency are passed with under 3 dB of
attenuation for low-pass filters.
Содержание Compact 1769-IR6
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Страница 116: ...Publication 1769 UM005A EN P February 2001 2001 Rockwell International Corporation Printed in the U S A ...