Dataforth
Specialists in data acquisition, signal conditioning and data communication

SCM7B40/41

Isolated Analog Voltage Input Modules, Wide Bandwidth

Each SCM7B40/41 voltage input module accepts one channel of analog voltage input which is filtered, isolated, amplified, and converted to a high-level analog voltage for output to the process control system.

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, the input signal is chopped by a proprietary chopper circuit and transferred across the transformer 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.
  • Accepts Millivolt or Voltage Inputs
  • Provides High-Level Voltage Outputs
  • 10kHz Bandwidth
  • 1500Vrms Transformer Isolation
  • Accuracy, ±0.03% of Span Typical, ±0.1% Max
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input Protected to 120Vrms Continuous
  • Easy DIN Rail Mounting
  • CSA Certified, FM Approved
  • CE and ATEX Compliant
Isolated Analog Voltage Input Modules, Wide Bandwidth

SCM7B40/41 Devices


Part Number Input RangeOutput RangeBandwidthMechanical FormatIsolation Voltage
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0 to +100 mV +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +100 mV 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +100 mV 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +1 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +1 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +1 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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-100 to +100 mV +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-100 to +100 mV 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-100 to +100 mV 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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-1 to +1 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-1 to +1 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-1 to +1 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +10 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +10 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +10 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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-5 to +5 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-5 to +5 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-5 to +5 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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-10 to +10 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-10 to +10 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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-10 to +10 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +5 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +5 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +5 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +20 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +20 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +20 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +40 V +1 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +40 V 0 to +5 V 10 kHz Modular plug-in-board 1500 Vrms
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0 to +40 V 0 to +10 V 10 kHz Modular plug-in-board 1500 Vrms

Frequently Asked Questions

How do the SCM7B22 and SCM7B41 differ?
The main difference is the SCM7B41 is an input module and the SCM7B22 is an output module.
This means that.

The 7B41 module has its input on the isolated field side of the module connect to it through screw terminal blocks. The 7B41 module has its output on the system and power supply side of the module connect to it through DB-25 connector (SCM7BP01, SCM7BP02, SCM7BP04, SCM7BP08, and SCM7BP16).

The 7B22 module has its output on the isolated field side of the module connect to it through screw terminal blocks.
The 7B22 module has its input on the system and power supply side of the module connect to it through DB-25 connector (SCM7BP01, SCM7BP02, SCM7BP04, SCM7BP08, and SCM7BP16).

Keywords/Phrases: 7B, 7B module, 7B input module, 7B output module, 7B22, 7B41
Can Dataforth provide calibration reports for modules I purchased?
Yes we can provide calibration reports for the modules that you purchased.

You can either
a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or
b) you can send us a list of model numbers and their serial numbers to support@dataforth.com
Analog Devices announced a last time buy and discontinuance of their signal conditioning modules. Can I replace them with Dataforth signal conditioning modules?
Yes, in general, Dataforth signal conditioning modules are a direct replacement for all Analog Devices signal conditioning modules. e.g. "SCM5B35-xx: Linearized 4-Wire RTD Input Modules" will replace Analog Devices "5B35: Isolated 4 Wire RTD Input Signal Conditioning Module".

Please note that Dataforth signal conditioning modules are RoHS II compliant.
If I purchase a backplane with no CJC, will I still be able to use modules that require the CJC enable jumper to be installed?
Yes. Backplanes with no CJC will still come with the CJC enable installed on the backplane.
If the input range of my signal conditioner is -1V to +1V and the output range is 0 to 10V, does this mean that it ignores polarity?
A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.
How do I convert an RMS voltage to its corresponding peak voltage?
To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414.

For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp
Is the calibration of Dataforth modules traceable to NIST standards?
Yes, calibration of Dataforth modules is traceable to NIST standards.
Where can I find the MTBF of my module?
Information on MTBF for SCM5B, SCM7B, 8B and DSCA is available on our website. Please see application note AN802 for more details. Application notes can be found under the "Literature" tab on the top navigation bar.
Is the SCMXPRT-003 DIN rail mountable?
The SCMXPRT-001 has an option for DIN rail mounting (part number: SCMXPRT-001D) but the SCMXPRT-003 does not. Instead, it can be mounted on the SCMXRK-002 which is a 19 inch metal rack for mounting the SCMXPRT-003 as well as various Dataforth backpanels and the SCMXIF interface board.
How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.
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Model NumberInput RangeOutput RangeBandwidthSensor TypeStatus*Comments
SCM7B40-1405
Request Quote
0V to 1V0V to 5V1kHzVOLTAGE INPUTQU 
SCM7B41-1415
Request Quote
-100V TO +100V-10V TO +10V10kHzVOLTAGE INPUTQU 
SCM7B41-1769
Request Quote
-10V TO +10V-10V TO +10V2kHzVOLTAGE INPUTPR 
SCM7B41-1770
Request Quote
-10V TO +10V-10V TO +10V10kHzVOLTAGE INPUTPR 
* ... Status Codes: PR = Production, PT = Prototypes, QU = Quoted

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