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SCM5B43

General Purpose Input Signal Conditioners with DC-Excitation, Bandwidth 1 kHz

Each SCM5B43 general purpose input module provides a single channel of transducer input which is filtered, isolated, scaled, and converted to a high-level analog voltage output. 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 ± 50 V 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.

The SCM5B43 can interface to devices which require a precision 10 VDC excitation supply. The 1 kHz bandwidth significantly reduces ripple and noise inherent in these devices.

Transducer excitation is provided from the module by a very stable 10 V source. The excitation supply is fully isolated, allowing the amplifier inputs to operate over the full range of the excitation voltage. This feature offers significant flexibility in real world applications. Ten full scale input ranges are provided, from±1V to ± 10 V, producing ± 5 V full scale output.

The input signal is processed through a pre-amplifier on the field side of the isolation barrier. This pre-amplifier has a gain-bandwidth product of 5 MHz and is bandwidth limited to 1 kHz. After amplification, 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 + 5 VDC, ± 5%.

Special input circuits on the SCM5B43 module provide protection of the signal inputs and the isolated excitation supply up to 240 VAC.

Circuit diagram Dataforth SCM5B43

Block Diagram SCM5B43



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10 Modules for Type SCM5B43:

ModuleInputDescription
SCM5B43-01 -1 to +1 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-02 -2 to +2 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-03 -3 to +3 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-04 -4 to +4 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-05 -5 to +5 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-06 -6 to +6 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-07 -7 to +7 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-08 -8 to +8 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-09 -9 to +9 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output
SCM5B43-10 -10 to +10 V SCM5B43 Isolated General Purpose Input Module, with DC-Excitation, with Voltage-Input and Voltage-Output

Specifications

top
  • Input: General Purpose input module
  • Output: ± 5 V or ± 10 V
  • Bandwidth 1 kHz
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • Input Resistance 2 MOhm
  • Accuracy ± 0.03%
  • Linearity ± 0.005%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 100dB
  • Sensor excitation + 10 V
  • NMR: 120dB / Decade > 1 kHz
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request