Impulse SCM5B32 User Manual
SCM5B32
Analog Current Input Modules
Description
Each SCM5B32 current input module provides a single channel of analog input
which is filtered, isolated, amplified, and converted to a high level analog voltage
output (Figure 1). This voltage output is logic switch controlled, which allows
these modules to share a common analog bus without the requirement of
external multiplexers.
The SCM5B modules are designed with a completely isolated computer side
circuit which can be floated to ±50V from Power Common, pin 16. This complete
isolation means that no connection is required between I/O Common and
Power Common for proper operation of the output switch. If desired, the
output switch can be turned on continuously by simply connecting pin 22, the
Read-Enable pin, to I/O Common, pin 19.
A precision 20Ω current conversion resistor is supplied with the SCM5B32
module. Sockets are provided on the SCMPB01/02/03/04/05/06/07 backpanels
to allow installation of this resistor. Extra resistors are available under part
number SCMXR1.
Signal filtering is accomplished with a six-pole filter which provides 95dB of
normal-mode rejection at 60Hz and 90dB at 50Hz. Two poles of this filter
are on the field side of the isolation barrier, and the other four are on the
computer side.
After the initial field-side filtering, the input signal is chopped by a proprietary
chopper circuit. Isolation is provided by transformer coupling, again using a
proprietary technique to suppress transmission of common mode spikes or
surges. The module is powered from +5VDC, ±5%.
Isolated Analog Signal Conditioning Products
▲
Features
Accepts Milliamp Level Signals
High Level Voltage Outputs
1500Vrms Transformer Isolation
ANSI/IEEE C37.90.1 Transient Protection
Input Protected to 240VAC Continuous
160dB CMR
95dB NMR at 60Hz, 90dB at 50Hz
±0.03% Accuracy
±0.005% Linearity
CSA Certified, FM Approved, CE and ATEX
Compliant
Mix and Match SCM5B Types on Backpanel
SCM5B
A special input circuit on the SCM5B32 modules provides protection against
accidental connection of power-line voltages up to 240VAC.
Figure 1: SCM5B32 Block Diagram
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Isolated Analog Signal Conditioning Products
SCM5B
Specifications
Module
Input Range 0mA to 20mA or 4mA to 20mA
Input Resistor
Value 20.00Ω
Accuracy ±0.1%
Stability ±10ppm/°C
Input Protection
Continuous 240Vrms max
Transient ANSI/IEEE C37.90.1
CMV, Input to Output
Continuous 1500Vrms max
Transient ANSI/IEEE C37.90.1
CMR (50Hz or 60Hz) 160dB
NMR 95dB at 60Hz, 90dB at 50Hz
(1)
Accuracy
Nonlinearity ±0.005% Span
Stability
Input Offset ±50nA/°C
Output Offset ±20µV/°C
Gain ±25ppm/°C
Noise
Input, 0.1Hz to 10Hz 10nArms
Output, 100kHz 200µVrms
Bandwidth, 3dB 4Hz
Response Time, 90% Span 0.2s
Output Range See Ordering Information
Output Resistance 50Ω
Output Protection Continuous Short to Ground
Output Selection Time 6µs at C
(to ±1mV of V
Output Current Limit +8mA
Output Enable Control
Max Logic 0 +0.8V
Min Logic 1 +2.4V
Max Logic 1 +36V
Input Current 0,1 0.5µA
Power Supply Voltage +5VDC ±5%
Power Supply Current 30mA
Power Supply Sensitivity ±20µV/% RTI
Mechanical Dimensions 2.28" x 2.26" x 0.60"
(h)(w)(d) (58mm x 57mm x 15mm)
Environmental
Operating Temp. Range -40°C to +85°C
ATEX Group II, Category 3 -20°C to +40°C
Storage Temp. Range -40°C to +85°C
Relative Humidity 0 to 95% Noncondensing
Emissions EN61000-6-4 ISM, Group 1
Radiated, Conducted Class A
Immunity EN61000-6-2 ISM, Group 1
R F Performance A ±0.5% Span Error
ESD, EFT, Surge, Voltage Dips Performance B
NOTES:
(1) Includes nonlinearity, hysteresis and repeatability.
(2) RTI = Referenced to input.
Typical at TA=+25°C and +5V power
)
OUT
SCM5B32
±0.03% Span
= 0 to 2000pF
load
Ordering Information
Model
Input Range Output Range
SCM5B32-01 4mA to 20mA 3, 4
SCM5B32-02 0mA to 20mA 3, 4
Refer to SCM5B392 specifications, p. 27, for additional current input models.
Output Ranges Available
Output Range Part No. Suffix Example
3. 0V to +5V NONE SCM5B32-01
4. 0V to +10V D SCM5B32-01D
(2)
SCM5B
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