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SCM7B32 Datasheet Preview

SCM7B32 Datasheet

Isolated Process Current/Voltage Input Modules

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Isolated Process Control Signal Conditioning Products
SCM7B
SCM7B32/33
Isolated Process Current/Voltage Input Modules
Description
The SCM7B32 current input modules accept input signals in the 4-20mA or
0-20mA ranges from the field and provide a high-level output to the process
control system (Figure 1). Current to voltage conversion occurs internal to the
module, which is factory calibrated to ensure the highest accuracy.
SCM7B33 voltage input modules accept input signals in the +1V to +5V or 0 to
+5V ranges from the field and provide a high-level output to the process
control system. As an alternative, the SCM7B33 can be used with an external
250resistor (Dataforth SCM7BXR1 or equivalent), to accept input signals in
the 4-20mA or 0-20mA ranges. Using the external sense resistor allows the
module to be removed without disrupting the current loop. All SCM7B33s are
shipped with a SCM7BXR1 resistor.
These modules incorporate a five-pole filtering approach to maximize both time
and frequency response by taking advantage of both Thomson (Bessel) and
Butterworth characteristics. One pole of the filter is on the field side of the
isolation barrier; four are on the process control system side.
After the initial field-side filtering (conversion-SCM7B32 only), the input signal
is chopped by a proprietary chopper circuit and transferred across the trans-
former isolation barrier, suppressing transmission of common mode spikes and
surges. The signal is then reconstructed and filtered for process control system
output.
Modules accept a wide 14 - 35VDC power supply range (+24VDC nominal).
Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal
for high channel density applications. They are designed for easy DIN rail
mounting using any of the “-DIN” backpanels.
Features
• Accepts Current or Voltage Input
• Provides High-Level Voltage Outputs
• 1500Vrms Transformer Isolation
• Accuracy, ±0.03% of Span Typical,
±0.1% Max
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected to 120Vrms Continuous
• Noise, 500µVp-p (5MHz), 300µVrms
(100kHz)
• 105dB CMRR
• Easy DIN Rail Mounting
• CSA C/US Certified
• CE and ATEX Compliant
Figure 1: SCM7B32/33 Block Diagram
72 For information call 800-444-7644
©1995-2011 Dataforth Corporation, All Rights Reserved ISO9001:2008-Registered QMS
http://www.Datasheet4U.com/




Dataforth

SCM7B32 Datasheet Preview

SCM7B32 Datasheet

Isolated Process Current/Voltage Input Modules

No Preview Available !

Isolated Process Control Signal Conditioning Products
SCM7B
Specifications Typical at 25°C and +24VDC
Module
SCM7B32
SCM7B33
Input
Signal Range
Bias Current
Resistance
Normal
Power Off
Overload
Protection
Continuous
Transient
4-20mA, 0-20mA
N/A
<100
<100
30k
120Vrms max
ANSI/IEEE C37.90.1
+1 to +5V, 0 to +5V
±0.1nA
2M
2M
2M
*
*
Output
Signal Range(1)
Effective Available Power(1)
Resistance
Protection
Voltage/Current Limit
40mW
<1
Continuous Short-to-Ground
±12V, ±14mA
*
*
*
*
CMV (Input-to-Output)
Continuous
Transient
CMRR (50 or 60Hz)
Accuracy(2)
Linearity(3)
Stability (–40°C to +85°C)
Gain
Input Offset
Output Offset
Noise
Peak at 5MHz B/W
RMS at 10Hz to 100kHz B/W
Peak at 0.1Hz to 10Hz B/W
1500Vrms
ANSI/IEEE C37.90.1
105dB
±0.03% Span typical,
±0.1% Span max
±0.01% Span typical,
±0.02% Span max
±35ppm/°C
N/A(4)
±0.003% Span/°C
500µV
300µV
1µV RTI
*
*
*
*
*
*
*
*
*
*
*
Frequency and Time Response
Bandwidth, –3dB
NMR (–3dB at 100Hz)
Step Response, 90% Span
100Hz
80dB per decade above 100Hz
5ms
*
*
*
Supply Voltage
Current(1)
Sensitivity
Mechanical Dimensions
(h)(w)(d)
14 to 35VDC
12mA
±0.0001%/%VS
2.13" x 1.705" x 0.605" max
54.1mm x 43.3mm x 15.4mm max
*
*
*
*
*
Environmental
Operating Temperature Range
–40°C to +85°C
*
Storage Temperature 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
*
RF
Performance A ±0.5% Span Error
*
ESD, EFT
Performance B
*
NOTES:
*Specification same as preceding model
(1) Output Range and Supply Current specifications are based on minimum output load resistance. Minimum
output load resistance is calculated by VOUT2/PE, where PE is the output Effective Available Power that guarantees
output range, accuracy, and linearity specifications.
(2) Accuracy includes the effects of repeatability, hysteresis, and linearity.
(3) Linearity is calculated using the best-fit straight line method.
(4) Input offset term included in output offset specification.
Ordering Information
Model
SCM7B32-01
SCM7B32-02
SCM7B33-01
SCM7B33-02
Input Range
4 to 20mA
0 to 20mA
+1 to +5V
0 to +5V
Output Ranges Available
Output Range Part No. Suffix
Example
+1 to +5V
0 to +5V
0 to +10V
NONE
A
D
SCM7B32-01
SCM7B32-01A
SCM7B32-01D
Visit our website www.dataforth.com
73
©1995-2011 Dataforth Corporation, All Rights Reserved ISO9001:2008-Registered QMS
http://www.Datasheet4U.com/


Part Number SCM7B32
Description Isolated Process Current/Voltage Input Modules
Maker Dataforth
Total Page 2 Pages
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