SCM5B Series

Isolated Analog Signal Conditioning Products

SCM5B MODULES

Each Dataforth 5B module provides a single channel of isolated analog input or output.

  • Input modules interface to all types of external sensors, then filter, isolate, amplify, and convert the input signals to high-level analog voltage outputs
  • Output modules accept high-level analog voltage signals from a host system, then buffer, isolate, and amplify them before providing process current or voltage output to field devices

5B Isolated Analog Signal Conditioning ProductsMore than 250 different 5B modules are available encompassing a wide selection of isolated analog input and output functions. Analog inputs include voltage and current in narrow and wide bandwidths, thermocouple, RTD, accelerometer, potentiometer, strain gage, frequency, and 2-wire transmitter.

All 5B modules are CSA C/US certified and CE and ATEX compliant.

Accessories include a complete selection of backpanels, DIN rail mounting options, interface cables, mounting racks, power supplies, and other accessory items.

ADVANTAGES

Designed for industrial plant environments, Dataforth's 5B modules protect user equipment from lightning and heavy equipment power line voltages and reduce electrical noise in measured signals.

Compared with competitive parts at comparable prices, these 5B modules provide:

  • 50 times better noise rejection by using a 6-pole filter with 95dB NMR
  • Lower output noise
  • True 3-way isolation
  • 20dB better CMR of noise spikes

CUSTOM SIGNAL CONDITIONING

Custom modules are available: consult factory for minimum quantity and pricing details on custom input ranges, output ranges, bandwidth, and other key parameters.

  • ±0.03% Accuracy (Typical)
  • ±0.005% Linearity
  • 1500Vrms Transformer Isolation & 240Vrms Field-side Protection
  • ANSI/IEEE C37.90.1 Transient Protection
  • 5V Power (30mA Typical)
  • 4- to 6-Pole Low-Pass Filtering
  • Up to 160dB CMR
  • 95dB NMR at 60Hz, 90dB at 50Hz
  • ±1µV°C Drift
  • Output Noise as Low as 150µVrms
  • -40°C to +85°C Operating Temperature
  • CSA C/US Certified (Class I, Division 2, Groups A, B, C, D)
  • CE and ATEX Compliant
  • Manufactured per RoHS Directive 2011/65/EU

SCM5B Series Product Family

Part Number Datasheet Description
Analog Voltage Input Modules, Narrow Bandwidth
Analog Current Input Modules
Isolated True RMS Input Modules
Linearized 2- or 3-Wire RTD Input Modules
Linearized 4-Wire RTD Input Modules
Potentiometer Input Modules
Non-Linearized Thermocouple Input Modules
Strain Gage Input Modules, Narrow Bandwidth
Strain Gage Input Modules, Wide Bandwidth
Current Output Modules
Matched-Pair Servo/Motor Controller Modules
Analog Voltage Input Modules, Wide Bandwidth
2-Wire Transmitter Interface Modules
General Purpose Input Modules, with DC Excitation
Frequency Input Modules
Linearized Thermocouple Input Modules
Accelerometer Input Module
Voltage Output Modules
Voltage Attenuator System for Analog Signal Conditioning
Accessories, backpanels, and module dimensions
Module Dimensions and Pinouts

Frequently Asked Questions


How do the SCM5B49 and SCM5B41 differ?
The major difference is the SCM5B41 is an input module and the SCM5B49 is an output module.
This means that.
The 5B41 module has its input on the isolated field side of the module connect to it through screw terminal blocks. The 5B41 module has its output on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07).
The 5B49 module has its output on the isolated field side of the module connect to it through screw terminal blocks.
The 5B49 module has its input on the system and power supply side of the module connect to it through ribbon cable connector (SCMPB01, SCMPB02, SCMPB05, and SCMPB06) or screw terminal blocks (SCMPB03, SCMPB04, and SCMPB07).

Keywords/Phrases: 5B, 5B module, 5B input module, 5B output module, 5B41, 5B49

Can the SCM5B41-09 withstand 300V input without damage?”
The SCM5B41-09 module can withstand 300VDC continuous on its input terminals without damage. However, the output voltage will go to one of the internal power supply rails and remain there for several seconds after the input returns within the specified +/-40V input range

Are non-Dataforth 5B modules compatible with Dataforth backpanels?
Yes, as long as the 5B module is compliant with or exceeds Analog Devices Incorporated 5B specifications.

Keywords/Phrases: 5B, 5B module, backpanel, Dataforth backpanel

Can you make SCM5B45-08 with +/-5V output?
This requires a custom designed module; we typically offer a single module custom solution with unit pricing for the required 10 piece minimum order and 7-8 week lead time. Please contact Dataforth at (520) 741-1404 if your application requires a non-standard range not offered in our product catalog.

Often times, a two module solution can help achieve the required output range. In the aforementioned case of the 5B45-08, one would connect its output to a 5B49-01 thus yielding a +/-5V output. Note that the accuracy specs will be additive across the two modules.

What is the function of backpanels for signals?
Think of the backpanel as a bidirectional signal transfer device whose direction is determined by the module in a particular channel.
For an input module, the signal is transferred from the field-side screw terminals to the system/power supply-side screw terminals or to a signal access ribbon cable header or D-sub connector.
For an output module it is just the reverse, the signal is transferred from the system/power supply-side screw terminals or from a signal access ribbon cable header or D-sub connector to the field-side screw terminals.

Keywords/Phrases: backpanel, 5B backpanel, 7B backpanel, 8B backpanel, SCMD backpanel

Does the SCM5B32 module require SCMXR1 resistor?
Please the SCMXR1 is installed in the back panel; one XR1 is usually shipped with the unit. If you can't locate it, please call Dataforth at 1-800-444-7644.

How do I connect the 5B45 to the field signal?
For Zero Crossing, connect the signal to EXC+ and the return to IN-.

For TTL, connect the signal to IN+ and the return to IN-.


Can you explain how to use the DIP switches on SCM5B48 to achieve different settings?
Below are the SCM5B48 configurable parameters and their associated DIP switch designators in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz

Switch S5 selects between DC coupling or AC coupling and between 0.2Hz or 10Hz low end of the High Pass filter cutoff frequencies.

Gain, S4: 1, 10, 100

Switch S4 selects from among the Gain settings = 1, 10, or 100. Since the output range is a fixed +/-10V -01 or +/-5V -02, the implication of this is that switch S4 actually selects the input voltage range as in the formula Vin = Vin max / G. Example: in an SCM5B48-01, S4 =10 the input voltage range is Vin = +/-10V / 10 = +/-0.1V.
Keep in mind, for DC coupling Vout = VAC + VDC which is limited to +/-10V total for -01 and +/-5V total for -02.

Excitation, S1: 4mA, 9mA

Switch S1 selects between excitation current sources of 4mA or 9mA +/-10%. They both have a compliance voltage of 24V +/-10%.

Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Switch S3 and S2 select from among the Low Pass filter cutoff frequencies of 2.5kHz, 5kHz, 10kHz, or 20kHz.


Keywords/Phrases: SCM5B48, SCM5B48 DIP switches, SCM5B48 settings


With the SCM5B33-06 and SCM5B33-07, what are the included jumpers for?
You install one jumper from the +EXC to the +In terminals and the other jumper from the –EXC to the –In terminals. This allows the traces on the backpanel and the traces in the module to the current shunt to share the excess current.

Keywords/Phrases: SCM5B33-06, SCM5B33-07, included jumpers, excess current

Do you know if the SCM5B33 can read the current / voltage for a system operating at 16.66 Hz?
It is possible, but less than 45Hz requires design of a custom module with 7Hz being the low limit.
Keywords/Phrases: SCM5B33, SCM5B33 low frequency, SCM5B33 lower frequency.

What is the total power consumption of the 5B backpanel?
The total power requirement on the 5VDC power rail is the summation of the power requirement of the individual modules as specified in each module specification. For power budget purposes, multiply the total power requirement you calculated by 1.5 for maximum power needed.

Keywords/Phrases: 5B backpanel, power consumption, power requirement, total power, total power requirement

I have an SCMPB07, does Dataforth have a 4-channel SCM5B backpanel?
No. However, a 4-channel DIN mount SCM5B backpanel can be made from the following list of parts.

Quantity Model Description
2 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC
2 SCMXBEFE DIN mount base element with snap foot
2 SCMXSE DIN mount side element
4 SCMXVS DIN mount connection pins

Or, alternately, if you already have SCMPB04-2 or SCMPB04-3.

Quantity Model Description
1 SCMPB04-2 or SCMPB04-3 2-channel DIN mount 5B backpanel with SCMXCJC or without SCMXCJC

Just add the following.

Quantity Model Description
1 SCMPB04 or SCMPB04-1 2-channel 5B backpanel with SCMXCJC or without SCMXCJC
1 SCMXBEFE DIN mount base element with snap foot
4 SCMXVS DIN mount connection pins

Is a plug-in conversion resistor required in order to use the SCM5B42 module?
Yes, a plug-in conversion resistor is required in order to use the SCM5B42 module. The current/voltage conversion is achieved by a plug-in resistor, SCMXR1 as shown in the block diagram in the data sheet.
Make sure the XR1 is installed in the back panel. The XR1 is usually shipped with the unit. If you can't locate it, please call Dataforth at 1-800-444-7644.

Is an external conversion resistor required in order to use the SCM5B32 module?
Yes, an external conversion resistor is required for the SCM5B32 module if it is to be used as a current input module. The current/voltage conversion is achieved by an external resistor, SCMXR1 as shown in the block diagram in the data sheet.
The SCM5B32 series without the resistor can be used for voltage inputs as well.
For the SCM5B32-01 that voltage range is: +0.08V to +0.40V.
For the SCM5B32-02 that voltage range is: 0V to +0.40V.

Keywords/Phrases: SCM5B32, internal resistor, SCMXR1, external conversion resistor

Can you explain what is the difference between the “Standard frequency range” and the “Extended frequency range” for the SCM5B33 module?
The user does not have to do anything special; the module operates seamlessly over the full frequency range of 45Hz to 20kHz. We needed to split the full frequency range into two ranges so we could define and specify the different accuracy levels associated with each subrange.
If you look further down the 5B33 Specifications under Accuracy, you will notice the Standard frequency range from 45Hz to 1kHz carries an additional +/-0.25% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.25% Reading) = +/-0.50%.
And the Extended frequency range from 1kHz to 20kHz carries an additional +/-0.75% Reading error. This error is in addition to the +/-0.25% Span error at 50/60Hz. So the total accuracy error will be +/-0.25% Span + (+/-0.75% Reading) = +/-1.00%.

Keywords/Phrases: 5B RMS, 5B True RMS, 5B RMS input module, 5B True RMS input module, 5B33

Can I use the SCMVAS-Mxxx modules standalone?
SCMVAS-Mxxx modules are high voltage input non-isolated attenuator modules. If used standalone, the module could potentially allow high voltage through to expensive data acquisition equipment. Therefore SCMVAS-Mxxx modules must be used in conjunction with an SCMVAS backpanel and an SCM5B30-07x or SCM5B40-07x isolation and signal conditioning module with input over-voltage protection.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx

I have an SCM5B33 module, what is the accuracy error between 0-10% span?
In Note 4, For 0-10% Span measurements add 0.25% accuracy error (-02 through -07) or 1.00% accuracy error (-01). Accuracy error includes linearity, hysteresis and repeatability but not source or external shunt inaccuracy (if used).

Keywords/Phrases: 5B RMS, 5B True RMS, 5B RMS input module, 5B True RMS input module, 5B33 accuracy

I have an SCM5B33 module, what is the total power consumption?
The max base power in all 5B33 modules is +5VDC x 140mA(max) = 700mW.

For Vout models, 5B33-01 to 5B33-07, add: 5V x 2mA = 10mW.
For Vout models, 5B33-01D to 5B33-07D, add: 10V x 2mA = 20mW.
For 0 to 1mA current loop output modules, 5B33-01B to 5B33-07B add 3mW.
For 0/4 to 20mA current loop output modules, 5B33-01C,E to 5B33-07C,E add 60mW.

The 5B33-06 has a 0.1? current shunt. Add 1A^2 x0.1? =100mW.
The 5B33-07 has a 0.025? current shunt. Add 5A^2 x0.025? = 625mW.

Keywords/Phrases: 5B33 power, 5B33 total power, 5B33 power consumption, 5B33 total power consumption, mW, watt, watts, milliwatts, heat, dissipation

The SCM5B42 can function as an SCM5B32, why can't the 8B42 function as an 8B32?”
The 5B42 has separate passive input connections on +In and -In and the 8B42 does not. If you notice, the - input (pin 3) on the 8B42 has NC (No Connection) to the internal circuits of the module.
The 8BB42 can only be used with passive 2-wire transmitters because the only connection into the module is through the +EXC (excitation power out) and the + (return signal current input) connection.
In the 8B product line, the customer will have to use the 8B32-01 passive current input module.

Keywords/Phrases: 5B, 5B42, 8B, 8B42, 8B32-01, passive 2-wire transmitters, passive current input

We have a lot of 5B racks that I would like to use, but I am not sure how to purchase the 34 conductor ribbon cable that these older 5B racks use. Do you guys sell the connectors and cable that I would need for the 16 channel 5B rack
“ If you are inquiring about the ISO-RACK 16, Dataforth does not make that. Please look up www.mccdaq.com; they make the ISO-RACK 16 and accessories.

If you wish to purchase Dataforth backpanels and accessories, you can look up www.dataforth.com. The base model number for our 16 channel backpanel is SCMPB01 and our ribbon cables are 26 conductor and their base model number is SCMXCA004. I have included the web address of the .pdf of the backpanels and accessories data sheet in the following line.

www.dataforth.com/catalog/pdf/scm5baccs.pdf

Keywords / Phrases:

ISO-RACK16, 34-conductor ribbon cable, SCMPB01, 26-conductor ribbon cable

On the 8B51, can I apply the + and – input leads “backwards” to reverse the polarity of the output signal?
This can be done only if the voltage source is floating (isolated); this pertains also to the SCM7B modules.
Better modules for true differential operation for which a floating source is not needed are the DSCA30/31/40/41. Other modules for this type of operation are the SCM5B30/31/40/41 used with an SCMPB07-x with the I/O COM jumpers Jn removed in the channels for which true differential operation is desired. Both the DSCA and the SCM5B outputs can float +/-50V with respect to power supply common.

Keywords/Phrases: 8B51, reverse input leads, true differential

On 5B backpanels, what is the threaded bolt connected to?
On the SCMPB01, SCMPB02, SCMPB05, and SCMPB06 backpanels the threaded bolt is directly connected to I/O COM and to an array of jumpers which enable a variety of grounding configurations. In the Attachments box to the right of this Content box, open or download the SCMPB01 or SCMPB02 data sheet. For a thorough discussion of grounding configurations, refer to the Grounding section.

What is the max operating output current for SCM5B input modules?
The max operating output current, which still allows the output voltage to remain within accuracy specs, for SCM5B input modules is +/-2mA.
The above limit allows a 5V output range module a >= 2.5k Ohm load.
The above limit allows a 10V output range module a >= 5k Ohm load.
The output current limit for SCM5B input modules is 8mA. At this current level the output load is 0 Ohm or a shorted output.

Keywords/Phrases: SCM5B output current, SCM5B input modules, max operating output current, output current

Can I use the SCMVAS-Mxxx modules standalone?
SCMVAS-Mxxx modules are high voltage input non-isolated attenuator modules. If used standalone, the module could potentially allow high voltage through to expensive data acquisition equipment. Therefore SCMVAS-Mxxx modules must be used in conjunction with an SCMVAS backpanel and an SCM5B30-07x or SCM5B40-07x isolation and signal conditioning module with input over-voltage protection.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx

What are feasible failure modes of the SCM5B36 and SCM5B41 devices?
The failures of the Voltage Regulator, Transformers, Oscillator, Analog Switch and the Power Supply Capacitors would cause the module output to go to 0V and the supply current will be 0mA. This failure mode may be accompanied by module supply current many times higher than published specification. These are the common failure modes. Other failure mode may result in output pegging to the output supply rail at 7.5V.

The Inputs are passive nodes and the input failures can cause the module output to go to 0V for both SCM5B41 and SCM5B36 series. The input failures of SCM5B36 may also peg the output to the negative supply rail of -7.5V.

The MTBF (Mean Time Before Failure) for SCM5B36 series is 675,000 hours and the same for SCM5B41 series is 680,000 hours. This failure rate calculation is derived from the MIL-HDBK-217 (Reliability Prediction of Electronic Equipment). The "Part Stress Analysis" method is used at a ground benign environment, +30°C temperature, and quality level B-2 to D-1 depending on the component. The specified humidity level is 95% RH noncondensing.

Keywords/Phrases: SCM5B failure modes, SCM5B36 failure modes, SCM5B41 failure modes

For SCM5B39 modules when I give LabVIEW (or other DAQ software) an output command, I get no output from the backpanel, why?
That’s because the SCM5B39 and the SCM5B49 are output modules, are connected the reverse of input modules, they have their inputs on the system side (power supply side) of the backpanel. They provide their output on the isolated field side of the backpanel.

Keywords/Phrases: 5B, 5B module, 5B output module, 5B39, 5B49

I looked into the SCMVAS-Mxxx modules, but are they truly DC Voltage Attenuators?
SCMVAS-Mxxx modules are actually DC attenuators because they are specified using + and – voltage limits. These are DC voltage levels or peak AC voltages. If they were meant to be AC voltage attenuators, they would be specified in Vrms.

Keywords/Phrases: 5B, 5B module, SCMVAS, SCMVAS-Mxxx, attenuation, high voltage

Does Dataforth offer SCM5B48 modules with customized fixed-parameters?
Please send Dataforth the selections for the four configurable parameters of the SCM5B48.
Below are the parameters in the order they appear left to right in the data sheet, Figure 2: SCM5B48 Side Label.

High Pass Filter, S5: DC, 0.2Hz, 10Hz
Gain, S4: 1, 10, 100
Excitation, S1: 4mA, 9mA
Low Pass Filter, S3, S2: 2.5kHz, 5kHz, 10kHz, 20kHz

Dataforth will assign custom module number, generate a data sheet, and send it for review and signoff.

Keywords/Phrases: SCM5B48 fixed-parameter, SCM5B48 preset-parameter, fixed-parameter, preset-parameter